one of s7 freezes after about an hour powered on - I am trying to deduce what or which component is giving problems. The rigs are currently racked and tied down neatly and taking it out with the PSU will be a hassle. My guess is a bad PSU. I am using the stock 1600w PSU by Bitmain. Anyone had this situation before, comments pls, it would save me a lot of time....