My Lumia has no sound after hitting search button

[TheFlyingFin]

Hello! This problem has bugged me quite a while now. If i hit the search button when im listening to music or watching a video, i hear a click, and after that no sound at all. The problem appears with and without headphones or bluetooth speaker. It is resolved by restarting the device, but it still is annoying since it happens very often, about 2-3 times daily. Soft- nor hardreset has worked to resolve it. The device is a Lumia 920 running preview for developers (though this has been going on even before i joined the preview)

Thanks in advance for the help!