We have two M51 phones. In both phones, while calling in loudspeaker mode, video calls or meetings, other person can't hear me properly.Whatsapp calls ends abruptly with microphone error.I have been to service center twice. They were of no help.We a...

We have two M51 phones.When calling in loudspeaker mode, video calls and meetings, other person can't hear me properly.In whatsapp, calls abruptly end with microphone error.This happens in both the M51 phones.I gave both phones in service center in...