Cisco IP phones randomly reset?

We have about 20-30 Cisco 7940 series IP phones and 2-4 Cisco 7960 series IP phones in use at this time. At random the phones will reset, sometimes mid call and other times not. All of the phones are powered through the ethernet cables and the workstations connect through the back of each phone's 10/100 switch. We have two servers, our primary CCM and secondary CCM. For some reason all of our phones are picking up our secondary server as the active CCM, and our primary server as the standby CCM. When a phone resets randomly, the application log on the secondary server shows:

Error: DeviceUnregistered - Device unregistered.
  Device name.: SEP000DBD7F69BA
  Device IP address.: ###.##.#.##
  Device type. [Optional]: 7
  Device description [Optional].: MI_Reception.Phone_7960_3000
  Reason Code [Optional].: 8
  App ID: Cisco CallManager
  Cluster ID: StandAloneCluster
  Node ID: ###.##.#.##
Explanation: A device that has previously registered with Cisco CallManager has unregistered. This event may be issued as part of normal unregistration event or due to some other reason such as loss of keepalives.
Recommended Action: No action is required if unregistration of this device was expected..

And on the primary server application log shows:

Error: DeviceTransientConnection - Transient connection attempt.
  Connecting Port: 2000
  Device name [Optional].:
  Device IP address.: ###.##.#.##
  Device type. [Optional]: 255
  Reason Code [Optional].: 6
  App ID: Cisco CallManager
  Cluster ID: StandAloneCluster
  Node ID: ###.##.#.##
Explanation: A connection was established and immediately dropped before completing registration. Incomplete registration may indicate a device is rehoming in the middle of registration. The alarm could also indicate a device misconfiguration, database error, or an illegal/unknown device trying to attempt a connection.
Recommended Action: No action is required if this event was issued as a result of a normal device rehome..

It appears the phones after reset are attempting to connect to the primary but fail to do so, then go back to the secondary.

Thanks in advance,
ScottStart Free Trial