Again ... about 6 Hours ago. N-Scrypt running well the last 15 Hours, then in the Night it switched to X13 and again back to N-Scrypt. 5 of my GPUs go off and 1 got the turn and was running well in the right speed

Any solution for this? Missing 6 Hours every Day hurts.
I use sgminer-5.0-pre-release-2014-06-11
That looks like my situation, but my 270x not stoped but started mine with very slow speed (20k instead of 230k). In the same time other rig with 280x switched without problems.
Distinctions in configs are:
270x config:
"pool-gpu-threads" : "2",
"pool-rawintensity": "5120",
"pool-thread-concurrency" : "6336"
280x config just define:
"pool-intensity" : "13"
this options defined in general part of 280x config (not pool part):
"gpu-threads" : "2",
"thread-concurrency" : "8192",
I think there is a problem with
pool-gpu-threads and
pool-thread-concurrency options - they dont work right according to my observations. On windows miner just crash if I even define same pool-gpu-threads for all pools. On linux (bamt) it works but with bugs