Login errors since updating to 11.2.3a

Initially I had updated ZCM to 11.2.3 and had no problems that we noticed. Tuesday I bumped it up to 11.2.3a, now I'm having major login problems. Systems are getting the "Unable to log into the ZENWorks realm because the system has disconnected from the network and the specified credentials did not match with the credentials cached on the system" error. Nothing besides the update has changed on our AD domain (used for authentication) or any settings in ZCM. If I restart our two primaries things seem to come back to life - for a bit. Then it reverts to this error for a bit, then it works for a bit.

Any thoughts on a fix would be greatly appreciated! Nothing I've searched for applies, it's not a DNS problem or a problem with active directory...

Thanks!