Problem with RX480 REF

Hi,

- Since yesterday, i have some problem with one of my six RX480 Saphirre REF 8GB, eveyrthing working well since some weeks, but after a little miner crash, i can't change any settings in wattman for this GPU, i take a screenshot to my gpuZ, if it can help you guys to find the problem.



- For the 5 others GPUs all is ok in GpuZ all 5 is the same.



PS : i try to clean uninstall AMD driver and reinstall, try to change GEN in Mobo BIOS, get off the battery of the Mobo for reset the BIOS, nothing work.
Sorry for my bad english guys

Any help would be appreciated, Thanks.