My STXL-6303E with guiding filter wheel suddenly will not download data when cooling, or even after cooling. Camera and filter wheel operate normally so long as I don't turn cooling on. When cooling goes to 100%, MaxIm DL hangs completely except for a "Camera Error (8)" popup, which means Timeout--consistent with what I see. I have to restart the camera and MaxIm after this. This hanging and error happens even after I've turned cooling Off. In other words, once cooling goes on, the camera then fails on its first attempt to send an image back to the PC. The cooling itself gets to 100% and then -35C as rapidly as ever, and images do improve with low temp (in TheSkyX)--so there's no obvious power supply or cooler failure. When operated directly from TheSkyX 10.5.0 with cooler on, the download also occasionally hangs and TheSkyX locks up. Drivers and Firmware are current per DriverChecker64. ASCOM is current at 6.2SP1. Win 10 Pro is up to date, and restarting PC makes no difference. My program is dead until I can get relief on this. Thanks.