I have been troubleshooting this for a few weeks on my M3LR as well - and it's been driving me crazy! I'm in the same boat that it only occurs M-F, and seems to kick off a few hours after I've arrived at the office. I also only have scheduled precondition on weekdays, so agree that's the likely culprit. I have several phones in the household that have access to the car, and they all get the same daily notification (android and ios).
I've tried:
-disabling overheat protection (even though it was set to fan only)
-turning off easy entry (thinking it was a weird profile glitch attributed with the last update)
-setting a scheduled departure for my work location with preconditioning on and off
-having my wife log out of the app thinking she was doing something accidently
-rebooted the car
-updated the app
Nothing has worked. I'm just to have found this to realize it's not just me.