There are Updates available i will test them:
Bootloader EEPROM from 2019-07-15 to 2019-09-10
VIA USB3 from 00013701 to 000137ad
I think i have found my problem. I have a script running to monitor the system. There is this query included:
if i disable this, everything works for hours without problems.
It seems there is a bug with this query.
Many thanks for the help!