I've been running Collatz on my 3 HD5870's and as of yesterday they started hanging up. It will run all out then suddenly stop. All previous WU's will be done and reported but I see 180 WU's "Ready to Start" with nothing else happening. It's the only GPU project that I have on this rig. I don't get it.
I had an issue with Milkyway as well... all 3 GPUs would be working then only 1 would work; however, I ignored the issue and moved to Collatz for the increased credits.
Has anyone else experienced this problem?