Mine ran for about 10 days before the m-board started failing. Only one slot that works on and off now. Hopefully I can get it replaced this week.
Running into a similar problem myself
One of the RMA'd h-boards runs fine for about 5 minutes, and then starts creeping down to 0 before it dies. Restarting the miner gives it some more life until it gives up again. Forcing everything to 52, have two fans on ensuring everything is cool... strange. This gear is very... temperamental
Was running fine for a week and suddenly starting dying on me today
Will continue troubleshooting :|
Edit: Yep, troubleshot some more. An H-card went flakey on me sometime today
If I stick the single flakey board in slot 0, it makes the m-board think there are 4 boards plugged in throwing massive errors. If I stick a working board in slot 0, and the flakey board in slot 1, slot 0 (good board) will eventually go to 0GHs and die completely, while the flakey board in slot 1 will hash at around ~30GH/s. If I throw the flakey card in slot 1 by itself, with nothing in slot 0, it doesn't work at all. I give up.
Edit2: More troubleshooting, put the unit on it's side, built a support structure out of Lego (cards slide into grooves on a long flat green lego board), and managed to Frankenstein the two cards to be stable @ ~30GH/s each. Very very strange *shrugs*
Edit3: Heh.