X Pilot ATC sound issues close to EDDF

Hi, I had some sound issues close to EDDF with X Pilot lately, one day I could hear APP but he could nothear me, so I disconnected and reconnected and the problem was solved. And yesterday all stations went ok (ATC all along EDDK to EDDF) but once landed I could neither hear the Ground nor Delivery, This problem got solved by itself after 2-3 minutes. There were a lot of ATC and pilots connected both days so I was wondering if it could be related…kind of saturation of the system…
Is this possible or is it more likely a problem on my side? When I got the second problem my fps were around 25 (with 3 monitors and XP11).