PBX won't register

For some reason my PBX very often fails to register/activate with Freepbx, which means none of my commercial modules work.

I once changed the NIC in this server but that is all. I have just tried updating to system admin beta .38 but that also seems to make no difference. This has been going on for a long while but normally sorts itself out within 1 or 2 reboots. Right now 5 reboots and no activation.

Can you please open a commercial module ticket at support.schmoozecom.com so that we can take a look at whats going on.