Zotac GTX 1080 TI Autofan not working

Hello everyone. I have a zotac 1080ti that seems to run per auto fan for 30 seconds to a minute. After the fan rolls down to 9-20%. I have tried setting the fan speed via overclock to no avail. I flashed the VBios again, successfully, same issue. Any suggestions? Bad Fans?

Forgot to mention, running current stable version and updated OS to current also.

Update. In watching the machine, the fan on the card starts out as I would expect at 70% (per autofan settings) once the miner gets going the fan rolls down to the teens. I have tried ETHminer, NBminer, Phoenix Miner, and LOLminer with no change in the issue. Thanks for any suggestions.