As others have already pointed out, v2.1 stops submitting shares after a random amount of time, and unlike previous version that stopped functioning only on my 280x's not 290's, this one stops working with all cards in a random amount of time (sometimes it won't even make it 10 minutes) Not only does it stop submitting shares, but it leaves the clocks at high powered state, i.e. it's drawing same amount as if it was mining, yet nothing happens. Sometimes -wd 1 kills the tasks, sometimes it doesn't. Cmd box shows last share submitted msg and nothing else after that. No error messages, gpu drivers haven't crashed, and the miner client is still responsive, but does not generate any msgs - no "new job received etc, nothing, nada, zilch (pools also show zero hash rate)
In this sate basically all it does is piss away electricity at full speed, like a locomotive with no driver and no destination.