Some times Samsung galaxy a71 Receiver and speaking sensor not works ,when someone call meGive the powerfull solution

I'm using Samsung galaxy a71,The same Galaxy a71 Mabile has network problemHow to solve this problem , reply the solution.

When u record in Samsung Galaxy screen recorder ,it is not recording screen it records only blank green screen ,what is the problem please give me a solution for thisThis is the blank picture recorder by screen recorderPlease give me a solution for...

how to play songs in Samsung music during call is going on. give me solution