No sound mid flight

Hello all! 

I was flying EGLL-KPHL in the 77W earlier today when i noticed that the pmdg sounds suddenly stopped. These are the pmdg specific sounds, button presses and so forth. I tried to press Q twice and that does bring back the FSX sounds but not the pmdg ones. I have also tried going into PMDG settings in the fmc and changing and changing back to my headphones in there (which usually fixes this problem) but it still doesn't work. This is my first flight in windows 10, and my impressions are positive so far. But if this continues I'll have to revert to 8.1.

Thanks in advance!