I had been having issues with my BitAxe lately. According to the mining pool, it kept going offline. It was also making a lot of noise. I replaced the stock fan with a noctua fan of the same size, and now it runs super quiet and has been reporting all good from the pool since. I suspect the fan wasn't working that well and was resulting in the chip overheating. Also, the noctua fan supports PWM which the stock fan didn't, so now I think it should run better regardless.