Claymore are you using VMPROTECT on the EXE files?
If so that could/would explain a lot of the problems people are having. It has some problems when dealing directly with hardware.
iam pretty sure it does..... use vmprotect
If so it would explain a lot of the memory errors and loosing touch with the hardware.
Yes I use vmprotect. Do you know a lot about it to state that it's the reason of problems with GPUs? If so, let me know more details, I will be glad to check it.
I always test both original and vmprotect versions on my systems and I never saw any differences for several months in different miners and other software I created.
For CryptoNote miner, for example, both versions don't work until I set pagefile 16GB.
If you have problems with vmprotect - miner will not start on your system at all because it does its job at starting only. If you see at least one line in console after starting - everything works properly.
The problem is in AMD drivers, they don't want to work with large memory sizes. Drivers just don't allow OpenCL app to allocate a lot of GPU memory at once. For example, 290X card has 4GB but OpenCL gives me less than 1GB at once by default. GPU_MAX_ALLOC_PERCENT variable is a solution (I can assign up to 3GB), but buggy solution as you can see. And AMD found a solution - today I tried Catalyst 14.6 and even with GPU_MAX_ALLOC_PERCENT I cannot allocate more than 1GB at once now. So they solved the problem

I have a couple of ideas about possible workaround, I hope it will help, new version will be available soon. Anyway, working with AMD OpenCL is some kind of magic which is much more unstable than vmprotect.