I too have this problem of the UR12 dropping in and out . Tried it on 3 different computers with Nvidia and AMD CPU/GPU combinations with zero luck . It works for a few seconds then cuts out , maybe works for 15 seconds tops , Seems to be utterly random . Tried different cables , external power supplies . Tried an alternative that a friend bought over and that just works . Thankfully in Australia we a “fit for purpose” law and this Steinberg product is going back to the shop for a refund . I have wasted way too much time on this thing .