Problem with signed apk android

A problem has arisen, when I generate a signed Apk to release and install it directly on the device it does not connect me to the rest services of my server, but I generate the apk signed in debug if it connects me without problems, and if I installed it in android studio I do not have any problem, will anyone know anything about this?

My configuration file:

build.gradle

// Top-level build file where you can add configuration options 
common to all sub-projects/modules.

buildscript {
  repositories {
    jcenter()
}
dependencies {

    classpath 'com.android.tools.build:gradle:3.0.0'

    //classpath 'com.google.gms:google-services:2.0.0'
    //classpath 'com.google.gms:google-services:2.0.0-beta2'

    //classpath 'com.google.gms:google-services:3.0.0'

    // NOTE: Do not place your application dependencies here; they 
 belong
    // in the individual module build.gradle files
    //classpath 'com.google.gms:google-services:3.0.0'
  }
}

allprojects {
  repositories {
    google()
    jcenter()
    maven {
        url "https://github.com/QuickBlox/quickblox-android-sdk-
      releases/raw/master/"
     }
   }
 }

  task clean(type: Delete) {
  delete rootProject.buildDir
 }

ext {
    compileSdkVersion = 23
    buildToolsVersion = "23.0.2"

    minSdkVersion = 14
    targetSdkVersion = 23

   sourceCompatibility = JavaVersion.VERSION_1_7
   targetCompatibility = JavaVersion.VERSION_1_7

   lintAbortOnError = false

// QuickBlox SDK version
qbSdkVersion = '2.6.1'

versionName = "2.6.1"

testRunnerVersion = "0.4.1"


// Dependency versions
playServicesVersion = '8.4.0'
//playServicesVersion = '9.0.2'
supportV4Version = '23.1.1'
appcompatV7Version = '23.1.1'
recyclerviewV7Version = '23.2.1'
supportAnnotationsVersion = '23.1.1'
designVersion = '23.1.1'

uilVersion = '1.9.0'
glideVersion = '3.6.1'
pullToRefreshVersion = '3.2.3'
stickyListHeaders = '2.7.0'
robotoTextViewVersion = '2.4.3'
stickersVersion = '0.7.3'
crashlyticsVersion = '2.2.2'
}


def makeJar(variant, project) {
//empty
 }

build.gradle of the module

apply plugin: 'com.android.application'

 android {
compileSdkVersion 23
buildToolsVersion '26.0.2'
//buildToolsVersion "23.0.2"

defaultConfig {
    applicationId "cibanco.com.mx.bcp"
    minSdkVersion 14
    targetSdkVersion 23
    versionCode 9
    versionName "3.0"

    multiDexEnabled true
}
buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 
'proguard-rules.pro'
    }
}

flavorDimensions "tier"
productFlavors {
    free {
        dimension "tier"
    }

    full {
        dimension "tier"
    }
   }
 }

dependencies {

compile fileTree(dir: 'libs', include: ['*.jar'])
//compile 'com.google.android.gms:play-services:9.4.0'
//compile 'com.google.android.gms:play-services:9.2.1'
//compile 'com.google.android.gms:play-services-maps:9.4.0'

//compile 'com.google.firebase:firebase-ads:9.0.2'

//compile 'com.google.android.gms:play-services:9.0.2'

compile("com.quickblox:quickblox-android-sdk-core:$rootProject.qbSdkVersion")
compile("com.quickblox:quickblox-android-sdk-chat:$rootProject.qbSdkVersion")
compile("com.quickblox:quickblox-android-sdk-content:$rootProject.qbSdkVersion")

compile project(path: ':sample-core')

//compile "com.google.android.gms:play-services:${rootProject.playServicesVersion}"
compile "com.google.android.gms:play-services-maps:${rootProject.playServicesVersion}"
compile "com.google.android.gms:play-services-gcm:${rootProject.playServicesVersion}"
compile "com.github.bumptech.glide:glide:${rootProject.glideVersion}"
compile "se.emilsjolander:stickylistheaders:${rootProject.stickyListHeaders}"

//compile 'com.google.android.gms:play-services-maps:9.4.0'
//compile 'com.google.android.gms:play-services-gcm:9.4.0'

/*
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:design:24.2.1'
*/
//compile 'com.google.android.gms:play-services-gcm:9.4.0'

//compile "me.leolin:ShortcutBadger:1.1.16@aar"

compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:multidex:1.0.2'
compile 'com.github.orangegangsters:swipy:1.2.2@aar'
compile 'com.roomorama:caldroid:3.0.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
 testCompile 'junit:junit:4.12'
  }

 //apply plugin: 'com.google.gms.google-services'

build.gradle sample core

apply plugin: 'com.android.library'

android {
compileSdkVersion rootProject.compileSdkVersion
buildToolsVersion rootProject.buildToolsVersion

defaultConfig {
    minSdkVersion rootProject.minSdkVersion
    targetSdkVersion rootProject.targetSdkVersion
    versionCode 1
    versionName "1.0"
  }
   buildToolsVersion '26.0.2'
  }

  dependencies {
    compile ("com.quickblox:quickblox-android-sdk-
    messages:$rootProject.qbSdkVersion" )

     compile "com.google.android.gms:play-services-gcm:${rootProject.playServicesVersion}"
compile "com.android.support:design:${rootProject.designVersion}"
compile "com.github.johnkil.android-
 robototextview:robototextview:${rootProject.robotoTextViewVersion}"

}

Manifiest

<?xml version="1.0" encoding="utf-8"?>

<!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

<permission
    android:name="android.permission.INTERACT_ACROSS_USERS_FULL"
    android:protectionLevel="signature" />
<permission
    android:name="cibanco.com.mx.bcp.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />

<uses-permission android:name="cibanco.com.mx.bcp.permission.C2D_MESSAGE" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.VIBRATE" />

<application
    android:name="com.quickblox.sample.chat.App"
    android:allowBackup="true"
    android:icon="@drawable/icon"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <!-- <uses-library android:name="com.google.android.maps" /> -->



    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="editada" />
    -->
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="editada" />
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <activity
        android:name=".activity.LoginActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait" />
    <activity
        android:name=".activity.MainActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".activity.OlvidoPass"
        android:screenOrientation="portrait" />
    <activity
        android:name=".activity.EstadoOperacionActivity"
        android:label="@string/title_activity_estado_operacion"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.NoActionBar" />



    <activity
        android:name=".activity.NotificacionesActivity"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.NoActionBar" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.SplashActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.LoginActivity"
        android:label="@string/login_title"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.SelectUsersActivity"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.DialogsActivity"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.ChatActivity"
        android:screenOrientation="portrait"
        android:theme="@style/ChatActivityTheme"
        android:windowSoftInputMode="stateHidden|adjustResize" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.ChatInfoActivity"
        android:label="@string/chat_info"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.quickblox.sample.chat.ui.activity.AttachmentImageActivity"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.Dark" />

    <receiver
        android:name="com.google.android.gms.gcm.GcmReceiver"
        android:exported="true"
        android:permission="com.google.android.c2dm.permission.SEND">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

            <category android:name="cibanco.com.mx.bcp" />
        </intent-filter>
    </receiver>

    <service
        android:name="com.quickblox.sample.chat.gcm.GcmPushListenerService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        </intent-filter>
    </service>
    <service
        android:name="com.quickblox.sample.chat.gcm.GcmPushInstanceIDService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.android.gms.iid.InstanceID" />
        </intent-filter>
    </service>

    <activity
        android:name=".activity.RHMenuCapacitacion"
        android:label="@string/title_activity_rhmenu_capacitacion"
        android:theme="@style/AppTheme.NoActionBar" />

</application>