iPhone front camera video with no voice

Hello everyone

Today my iPhone front camera suddenly records videos with no voice

I tried using the voice memos and they work well also do the videos with the back camera

When I start recording with the front camera and I flip it upside down and talk and then return it to its normal position and talk it will record with voice properly

Also when I use my headphones and record with the front camera it records well with voice

This problem is with the original camera app that comes in the iphone and third party apps

Whats the problem what should I do ?