This is how they work, get used to it.
You can improve performance by cleaning the over-application of heatsink compound between the heatsink and the processors. This will keep the units from going ZOMBIE but you will still need to reset them every few days.

Also, the Bitmain CGMiner does not (as I recall) support non-Bitmain devices, so if you are trying to run additional miners at the same time, forget it.