changed & still problem..
Try resetting your cards to default clocks. It might be overclock related.
but claymore can run without problem.
Does your system have enough page file size? You must set it to 6x8Gb = 48Gb.
And these prameters is needed:
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
Without them miner exists.