Hello, I'm developer with Unity 2018.1.6f1 and I used GMA unity v3.15.0.
Sometime I got ANR after watch rewarded video.
"main" tid=1 Native
"main" prio=5 tid=1 Native
| group="main" sCount=1 dsCount=0 obj=0x745f7598 self=0xaff84400
| sysTid=1297 nice=-4 cgrp=default sched=0/0 handle=0xb2dff534
| state=S schedstat=( 0 0 0 ) utm=237 stm=98 core=2 HZ=100
| stack=0xbe29a000-0xbe29c000 stackSize=8MB
| held mutexes=
#00 pc 00000000000177ac /system/lib/libc.so (syscall+28)
#01 pc 00000000000471dd /system/lib/libc.so (_ZL24__pthread_cond_timedwaitP23pthread_cond_internal_tP15pthread_mutex_tbPK8timespec+102)
#02 pc 0000000000271be8 /data/app/com.pianotiles.battle.mode.free-1/lib/arm/libmono.so (???)
#03 pc 0000000000271924 /data/app/com.pianotiles.battle.mode.free-1/lib/arm/libmono.so (???)
#04 pc 0000000000288b2c /data/app/com.pianotiles.battle.mode.free-1/lib/arm/libmono.so (???)
#05 pc 00000000002892bc /data/app/com.pianotiles.battle.mode.free-1/lib/arm/libmono.so (???)
#06 pc 000000000023e180 /data/app/com.pianotiles.battle.mode.free-1/lib/arm/libmono.so (???)
#07 pc 000000000023e4fc /data/app/com.pianotiles.battle.mode.free-1/lib/arm/libmono.so (???)
at com.unity3d.player.ReflectionHelper.nativeProxyInvoke (Native method)
at com.unity3d.player.ReflectionHelper.a (unavailable)
at com.unity3d.player.ReflectionHelper$1.invoke (unavailable)
at java.lang.reflect.Proxy.invoke (Proxy.java:813)
at com.google.unity.ads.UnityRewardBasedVideoAdListener.onAdRewarded (UnityRewardBasedVideoAdListener.java)
at com.google.unity.ads.RewardBasedVideo$1$1.onRewarded (RewardBasedVideo.java:95)
at com.google.android.gms.internal.ads.zzahj.zza (unavailable)
at com.google.android.gms.internal.ads.zzahf.dispatchTransaction (unavailable)
at com.google.android.gms.internal.ads.zzek.onTransact (unavailable)
at android.os.Binder.transact (Binder.java:499)
at com.google.android.gms.ads.internal.webview.ac.run (unavailable:8)
at android.os.Handler.handleCallback (Handler.java:751)
at android.os.Handler.dispatchMessage (Handler.java:95)
at android.os.Looper.loop (Looper.java:154)
at android.app.ActivityThread.main (ActivityThread.java:6316)
at java.lang.reflect.Method.invoke! (Native method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:762)