Aura H2O USB-Connection issue

My Kobo Aura H2O has an issue with ths (micro)USB-port.
It can be charged by USB-Connection with no issue.

Data transfer is only possible, when I attach the USB-cable BEFORE I start the reader. The window appears with the option to connect the reader with the computer.

This is the only way to get a working USB-Data-Connection. I always have to switch off the reader, then attach the USB-Cable to the reader and my computer and the turn on the reader.

So, the hardware seems to be ok, but the behavior is weird. I did some factory resets. But nothing helped. Is there a way to get a "deep reset"....so that the reader is set back to the starting point as it is brand new (showing a scheme how to turn on the reader)?

Any other ideas?

Update....it appears only on my MacBook. Using a Windows Laptop is without issues.

I'll try to fix it by flashing the original image.