HI Jones,
We need to get the order this unit came off of. Can you private message me your order number for this unit? It would seem to be a processing issue with the DVR. Also is this the current version after you updated the unit?
Device Model: DVR
Record CH: 32
Alarm In: 16
Alarm Out: 6
Hardware Version: V2.0
System Version: 3.200.0003.1
Build Date: 2014/11/27
Web: 3.2.7.48117
SN: PA4CF023W00132
If it changed after the update we will need that to.
For a temporary fix put the hard drives into groups and then assign the cameras evenly to those groups. Keep me post if that has any affect.