Chosen Solution

My iphone 6s microphone makes static noise/crackling sound/and is kind of muffled during calls and in voice memos too! I’ve already replaced lightning connector/microphone/audio jack assembly 2 times thinking the problem was in microphones. But strangely enough it didn’t fix the problem. When I shake or softly bang the phone against a soft surface or my palm a few times the voice gets somewhat clearer. Do you know the exact solution to this? Is it better to get rid of this phone or try fixing it again?

Such fault actually can be seen mostly on forcibly dropped iPhones.This issue is related to Audio ic issues. This is a hardware issue.