It's getting cold this weekend? I'm starting to think issues being reported are heat related. The unit I had brought up from you has been running without issue since I powered it on 10 hours ago. The first thing I did when I received your unit is tighten any loose screws. Next I flipped the handles around to give the outside chips some breathing room.
For those still experiencing issues after doing these 2 things, I suggest moving the units to a cooler environment or lowering the clock freq.
I kinda knew that one was a good unit when I started getting the same results after pulling it out of the chain later that evening. My room is not warm though it has a window A/C and stays at a comfortable 76 degrees. I know 50 would be better. I'm not ruling out the heat theory these things may not like 76 degrees.
I had a few Lucko chili boards in the past and some would reset if it was too hot and others would reset if it was too cold (strange I know).
What I did last night was just let it go, instead of forcing boards to come alive by rebooting the controller or cycling the psus. They did the reset cycle several times but then just on it's own it just stopped resetting and started hashing with PwrDn at 0 and HWe at .43%.
They have been up now for 14 hours no resets at all hashing at 2.89 TH/s again.
I was thinking a lot about the controller it can handle 5volts to around 13volts. There is a voltage regulator inside of it. I know the real voltage is closer to 5 volts then 12 volts.
so if you feed it 12 volts the regulator will make a bit more heat.
When I used the controller with 5 volts 1amp I let it stand up.. kept it cooler
EDIT: You may be on to something this started about the same time I moved my controller and it is in a warmer spot.