audio mute issue after sometime in devkit8000 board

Dear all,

I am using devkit8000 board, where the audio becomes suddenly muted after using it for long hours.

I am using linphone to make and recieve calls, where during voice conversation, after 45 mins, the sound becomes muted.

then close the application. try aplay and arecord, both does not work.

Only solution is to power off and on the board.

Thanks and Regards,