for you it seems to cause problems... for thousands of others it works fine
Did you consider that it _maybe_ isn't the Kemper, but _maybe_ your specific setup? (Windows version, USB driver version, USB interface hardware, USB hub, virus protection, CPU load, still a bad/too long cable despite being 'new' etc. etc. etc. )
.... just a thought
almost 4 years using the Kemper Stage and zero issues with the USB cable,im on Mac