Crash on Android

Hello i released game in googleplay and i have a lot of crash report. java.lang.IllegalStateException: at com.epicgames.ue4.u.run (Unknown Source). The game works perfectly on my devices (Samsung S3 , Samsung Galaxy note 3).Yesterday i tried with Galaxy note 2 and it crash at submitting score.Not always but frequently i deleted googleplay games data and problem seems to gone for that phone. I dont know what is the problem and how to fix it.
Here most crahs log file:

Log1

This is the most crash report i got. I think this one obout InterstitialAd

  java.lang.IllegalStateException: 
  at com.google.android.gms.ads.internal.client.zzaf.b (Unknown Source)
  at com.google.android.gms.ads.internal.client.zzaf.show (Unknown Source)
  at com.google.android.gms.ads.InterstitialAd.show (Unknown Source)
  at com.epicgames.ue4.u.run (Unknown Source)
  at android.os.Handler.handleCallback (Handler.java:739)
  at android.os.Handler.dispatchMessage (Handler.java:95)
  at android.os.Looper.loop (Looper.java:145)
  at android.app.ActivityThread.main (ActivityThread.java:5942)
  at java.lang.reflect.Method.invoke (Native Method)
  at java.lang.reflect.Method.invoke (Method.java:372)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1400)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1195) 

Log2

This crash report is the second one the most i got

  java.lang.ExceptionInInitializerError: 
  at java.lang.Class.newInstanceImpl (Native Method)
  at java.lang.Class.newInstance (Class.java:1319)
  at android.app.Instrumentation.newActivity (Instrumentation.java:1054)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2097)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2230)
  at android.app.ActivityThread.access$600 (ActivityThread.java:141)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1234)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loop (Looper.java:137)
  at android.app.ActivityThread.main (ActivityThread.java:5041)
  at java.lang.reflect.Method.invokeNative (Native Method)
  at java.lang.reflect.Method.invoke (Method.java:511)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run 
  (ZygoteInit.java:793)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:560)
  at dalvik.system.NativeStart.main (Native Method)

  Caused by: java.lang.UnsatisfiedLinkError: 
  at java.lang.Runtime.loadLibrary (Runtime.java:371)
  at java.lang.System.loadLibrary (System.java:535)
  at com.epicgames.ue4.GameActivity.<clinit> (Unknown Source)