Hey Tim,
I've heared of issues that running omnicheck -dns -full might bring down INET on clients. To be honest, this command has no practical use (to me). It works fine in flat networks without firewalls but things getting complicated when cell_info contains hosts in isolated networks. I asked Daniel Braun to disable those kind of checks by default in the next BRICK release to protect the innocent and speed up collection without modification.
If you're able to bring down INET on a client that was running in debug mode (1-500) support will be able to resolve it.
Regards,
Sebastian Koehler