To add it here: Customer has updated to a newer RC-snapshot as the earlier got him a few report emails of the box for getting packet loss sometimes (not that often) and he wanted to check if that would be fixed, too.
On the latest RC snapshot thus far no problems to report. No crash dump, no freeze, no panic. Also the packet loss seems gone too :) So happy on both fronts for now - makes me happy to report that.
Great job everyone involved. Shoutout to TAC support for their help and staying on the topic, too!
Cheers
\jens