My 13 card rig has been running great for 5 weeks, last night it dropped to 11 cards, SMOS sees them at boot but claymore doesn't somehow I think.

I get this after OC is applied
AMD Cards available: 13|

Then a moment later when claymore loads I get this

GPU #0: algorithm ASM
GPU #1: algorithm ASM
GPU #2: algorithm ASM
GPU #3: algorithm ASM
GPU #4: algorithm ASM
GPU #5: algorithm ASM
GPU #6: algorithm ASM
GPU #7: algorithm ASM
GPU #8: algorithm ASM
GPU #9: algorithm ASM
GPU #10: algorithm ASM
Total cards: 11


Then it sets off mining on 11 at full speed, 13 cards show in the SMOS GUI.
Any ideas on this?