UR12 sound problem the sound wavers gets louder, sometimes fades out

UR12 sound problem is the sound wavering gets louder, sometimes fades out for a moment, then is experienced( vst guitar monitoring) when using. It used to happen in the past but now it is more and more frequent. I have the latest software installed but have experimented with the oldest. Windows 10 operating system Ur 12 latest driver. I have been using it for a long time I can’t tell if hardware when software is faulty really 100%

Thank you in advance for your replies

Hello John