It's a very intermittent thing, and lasts for a very short time. Overall the average rate is stable even looking at my own S5's and to specs. Not saying they won't take that 200 GH drop for no reason what-so-ever, but it recovers pretty quick.
As long as the chips are running fine and you're not getting HW errors out the back side I think it's something that's just a design flaw.
If you're looking for two more used Bitmain S5s and are in the US let me know. I'll toss em your way at a loss to what I purchased them for, but you pay for shipping. Have the original packaging so they would be securely shipped. Would rather put that money toward another S7.
As long as the chips are running fine and you're not getting HW errors out the back side I think it's something that's just a design flaw.
If you're looking for two more used Bitmain S5s and are in the US let me know. I'll toss em your way at a loss to what I purchased them for, but you pay for shipping. Have the original packaging so they would be securely shipped. Would rather put that money toward another S7.