HTC Desire Mic problem

[dasche2]

my htc desire is facing a strange mic problem since some months. I m on unofficial ICS rom (COS-Bravo-ICS) since a year all works perfectly but sometime randomly mic stops working and other person cant hear my voice, although it works perfectly if i test it by sound recorder app.

I always restart the phone once to solve this problem but after some hours or days it happens again. I suspect its due to charging or due to wifi. or may be a kernel issue??

Any help would be really appreciated.