s7 edge keyboard and back button lag

[Atiq746]

So been a fee weeks ive been having keyboard lag and back button lag.
I have to press back couple of times for it to respond. Works fine on built in apps. Only happens on Snapchat whatsapp etc. Sometimes keyboard stays on home screen. Tried everything but no help

 

[Marcelo_P]

Same issue here. Started out of nowhere.

 

[Marcelo_P]

Problem disappeared out of nowhere as well..