The pool-side hash rate for one of my S9's dropped today to about 2/3 of expected. Looked like a bad board, and indeed in local status when I checked it was showing 0 in the GH/s(RT) column for one of the boards (though under ASIC i've still got all o's).

I powered it down, cleaned it out, restarted and now the local status shows ~4,500 in the GH/s(RT) column for all 3 boards. But the poolside hashrate is still showing ~9.5TH/s for that unit.

Has anyone had something like this happen before? Any advice?