Hi @attila,
thanks for your reply. I checked the USB port and counterpart, cleaned both with gentle air pressure, but unfortunately no change. As additional info, it looks like the error message is altering. It's only popping up for very short time, so barely readable.
E.g. I got also a "Communication with the deivce failed 2 DptiIO failed ERC:2 out:8 in:8192 Analog In noise failed."