Hello.
Over the past few days 2 af my 3 my S9s has started acting strange. (been running fine for 4+ months) They start to mine slower after running some time, sometimes its hours sometimes minutes.
I tried resetting them and also updated to latest firmware Antminer-S9-all-201704270135-autofreq-user-Update2UBI-NF.tar.gz.
There is no known problems from bitmain that fits my problem. no ASCI errors, fans are running and all.
one is 14T one is 13T model, i have another 13T that runs fine also upgraded to the same firmware.
How do i make sure i used the right firmware and should have used the one with fixed freq? What am i missing?
https://ibb.co/eJrK9Q