2020 Wrangler Rubicon - electrical insanity ... help!

Hi
Just purchased a used 2020 Wrangler Rubicon with 68,000 miles on it. On the drive home from the dealer the insanity started already ...

Symptoms: Power steering fails, Service Shifter message, Stability Control Module warning, gauges are possessed (up and down), sometimes wipers turn on as well.
Turning car OFF and ON makes it work normal for an undefined time. Does not seem to be a module/sensor problem but an intermittent wiring issue.

What was done so far:
Brought it back to the dealer - stayed there for two weeks - no failure found - hundred point inspection (right!).
Got it back and symptoms returned just like before. Decided to do my own "fixing".
Eliminated the Aux battery (fuse and negative cable), re-seated all fuses in the box, checked all connectors under car (I hope?). Checked the green connectors under the glove box.
Read the codes with JScan software and there are many, many codes, but all related to loss of CAN-bus connection and communication loss between modules.
I am kind of frustrated at this time. Did anybody experience something similar and was able to fix it somehow? Any pointers welcome ...

Mike