I'm still testing some of this, but may be worthwhile to test and do a preset from scratch (do not import from axe fx 3, old backup, etc). I talked to support on a couple issues and some thoughts are that it may be the preset itself. I did a preset from scratch, same blocks, etc, and the fan hasn't kicked back on as of yet. Temps stayed at 93 yesterday with it in my office, mounted to my templeboard with sufficient ventilation. We were actually troubleshooting a different issue altogether, but so far this has been the side effect and as of yet I haven't experienced the other problem on the newly created preset. Yes, this will certainly inconvenience people if you have to recreate presets but hopefully further firmware updates can resolve the underlying issue.
as mentioned above in my case the fan also starts spinning with an nearly empty factory preset using 18% cpu:
"loaded the factory preset 383 "BYPASS" with ~18% cpu "