Hello Larry,
I'm including couple of threads regarding this topic.
http://community.cambiumnetworks.com/t5/ePMP-2000-and-1000/GPS-Sync-I-m-tired/td-p/60625
- Make sure GPS firmware version is latest
- If running SW version 3.X, they were affected by a high CPU utilization SNMP issue which was affecting GPS Sync performance. This was fixed in SW version 3.3
- GPS antenna reposition may help
- Increasing the Synchronization Holdoff timer (default is 30secs) may help preventing SM disconnects, if the GPS sync loss are short in time
Regards