Since I have installed v1.6.4c Firmware, I had no more BSD crashes.
The A/Z noise has not been addressed by Keithley, not even a word of explanation, as far as I know.
The display works perfectly from a viewing and touch perspective, no issues at all.
The DMM7510 is a really nice instrument and besides the A/Z noise, it can be highly recommended.
The ACAL works more stable, compared to the Keysight 34470A
And the instrument reads stable after only 3 min after the cold start.
Nice Christmas present!