Hi Sven,
Sounds like the RRC's power supply may have died. It will pull power from the USB instead.
Try a different one to see if that solves the problem. I am not really sure if it will, since some
LED's were still lit with the power supply, but it is worth a try.
If that isn't it, then the RRC may be defective, which is very rare. It is 99% something in the
environment that changed if the system stops working, but your problem is indeed strange.
73,
Mitch DJ0QN / K7DX