I can't boot in safe mode,no pop-up appears,and it seems that neither facebook or messenger cause that,as it still happened after uninstalling them,it means another app is causing the problem and another one got updated and is causing the problem
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1.it seems facebook is the one doing it,will try fb lite and reinstalling it
2.The native option,on android 6.0,where you can activate mobile data,location,automatic rotation etc
3.It seems the phone is the problem