If not using the quantum doesn't stop the crashes, I'll go up and disable the entire solar array to see if that makes a difference. I know some people were suffering minor lag whenever the thing is fully active and in the daylight.
As for the two hour window, I think I was on at that time, Bullseye has been using his quantum just about every chance he gets (and gets kicked for 'hacking' because of the speed more often than not), I spent some time running the reactor on incinerate while going for power (it's still setup, just turned off by redstone), and I've had my panels on about 75% instead of 50% lately (150 panels out of 200)