Follow up on Kemper support in response to another email from me:
Marc @ Kemper Amps Support
I don't have more than this response for you. The log you've sent over doesn't show anything special that needs further analysis.
With best regards, Marc
Kemper Amps Support Team
Looks like Kemper is done as far as "supporting" my issue. This is my first interaction with the support team and I have heard good things about them from posts on this forum. I have also seen posts where users were frustrated with the the level of support they received. So, count me in the frustrated group.
The following 2 sentence word salad from support has me baffled: We've introduced the error message you're seeing as a result of frequent support inquiries which indicated USB related issues. The issue itself was present all the time. Perhaps this is a sentence constructed by a non-native English writer? It makes zero sense. The overall message is that I'm on my own to figure it out. Maybe this will motivate me to hang a scope on the lines and attach the USB protocol analyzer at my work to figure out what is going on. Not how I want to spend my time.
This has made me curious as to whether Kemper units have achieved USB compliance certification. I haven't seen Kemper use the USB compliance logo in any of their material.