Hi, I have searched on the forum and internet for this topic and, although it seems to be a common issue, there is no proved solution. I'm using:

- Antminer S9 13.5 Th/s
- PSU AWP3++ Power Supply
- Hardware version: 16.8.1.3
- Kernel: Linux 3.14.0-xilinx-ge8a2f71-dirty #82 SMP PREEMPT Tue May 16 19:49:53 CST 2017
- File System: Fri Nov 17 17:57:49 CST 2017 (just updated)

My issue is that after 3 or 4 hours of working one of the boards is missing from the Status table and the hashrate is 2/3 (9.3 TH/s more or less). I can confirm this "change" with the mining pool monitor (currently using Slush pool). If I reset the antminer, all boards are listed and everything seems to be ok.

In some threads people say that by changing the AWP3++ to a non-Bitmain 1600w PSU it fixes the issue. Is this true? (if so, which one do you recommend?)

Others say that by sending to warranty the board (or the entire unit) it would fix it, but some people say that the issue persists.

So, I'd like to know if someone has a solution for this or can guide me for troubleshooting this

Thanks!!!!