I haven't had these problems with my miners, a lot others, but no this ones, I recommend you to open a ticket on bitmain's website and explain the situation, it seems, I'm not sure, the control board, you mentioned they are still under warranty, use it, because after that they charge between 200-300$ for repair any board plus shipping, before that you could try reflash the firmware, or maybe try the stock firmware they came with if you can find it. the fan speeds look unusual, they should be spinning at around the same rpms, when you open the ticket at bitmain's they give you the option to upload screencaps, explain the problem to them, I think is the control board not sure.