Game going blank whenever I get an achievement or try to type

Dear employee or whoever is reading this , 

I have been playing minecraft bedrock edition for a long time and I have been facing a glitch since the very beginning . Whenever I get an achievement or try to type in the chat box, the screen goes blank and the keypad or achievement box continuously flickers. Please try to resolve this glitch as I have been facing it for a very long time and it gets irritating too. I have seen this glitch only on my minecraft game.

Regards 

Rishit