So, one step further or probably not.
First @rfauske: Yes, i have removed the pinion from the main gear, and there first test runs were ok, but difficult is, that the problem occurs from time to time, not always.... so this is not really meaningful.
I have installed the antistatic kit from logo and tried some test runs. Motor RPM stills goes down from time to time. The spirit unit isn`t rebooting any more when the RPM goes to zero, but basic problem is still the same.
I have tried with firmware version 2.4.3, here are the errors in the spirit log:
00:00 Calibration Finished
00:10 Good Health Message
00:20 Good Health Message
00:30 Received Frame was Corrupted00:40 Good Health Message
00:50 Good Health Message
01:00 Good Health Message
01:10 Governor was Engaged
01:20 Good Health Message
01:30 Good Health Message
01:40 Governor was Engaged
RPM Sensor data are too noisy01:50 Good Health Message
02:00 Good Health Message
and with the newest firmware 2.5.2:
00:00 Calibration Finished
00:10 Good Health Message
00:20 Good Health Message
00:30 Governor was Engaged
RPM Sensor data are too noisy00:40 Good Health Message
Still any suggestions, because I am clueless now
Tino