Avalon 841 fan speed issues help?

[Megaquake]

I have been having issues with one miner shutting down so I went and brought it back home and its overheating but extremely clean so I ran it here and it runs for two to 3 min the fan set to 100 percent minimum it will slow the fan down and the temps will hit 145c + and stop any ideas? the firmware does not reflect the fan slow down either running the latest MMC and firmware on the controller

Tried a different fan 5850RPM / 100% same issues  its telling me the fan after 3 minutes exact  1290RPM / 100%

I just restart cgminer and it runs fine again for 3 more minutes I am puzzled

[PassThePopcorn]

Odds are one of the chips is overheating, post a full log with code tags and we can figure out which one it is.