What to do about audio loss in Lumia 800?

Question

Audio

Apparently, the problem is encountered by many, but there is very little discussion on it, and there are no solutions as such. The sound is periodically turned off during calls, both incoming and outgoing. The interlocutor does not hear me either. At the same time, the connection goes on, the timer works. Speakerphone does not turn on. As some phone owners write, the problem is not only in the mobile network, but also in Skype (it means that it is most likely not the operator or the SIM card). Rebooting the phone helps. The problem appears rarely and spontaneously.
Carrying the phone to the service did not give anything, since the problem is treated with a simple reboot. And it was not possible to catch the error directly in the service, immediately after the reboot.
It turns out you are calling or waiting for a call, but here such garbage. After that, you need to restart the phone, then call back. It's annoying.
Nobody faced?