1. Update: Unfortunately, the system went offline again today (September 15) with a complete freeze/loss of connectivity, requiring a manual reboot.

Seems to be the same as T7795: dhcp6c doesn't update pltime and vltime for dynamic ipv6 prefix

Seems to be the same as T9284: dhcp6c integer overflow / garbage value in pltime causes vyos-netlinkd loop and loss of connectivity

1. Update: Additional Log Excerpt & Workaround Observation