Hubby was letting me know that he didn't hear an announcement of the thermostat changing (been using that to test the thermostat schedule) and when I went to take a look it seems that the Thermostat Scheduler is setting the thermostat Leave when I have no schedule set for Saturday & Sunday. Unfortunately I can't find any logging from that time, but here are some screen prints of the app. Let me know if you need anything else. I am on version 220.127.116.11, didn't see any Thermostat Scheduler fixes in the 18.104.22.168 release notes.
I think I'm having this also (22.214.171.124). Seems to be disregarding the days of the week and just applying all schedule events on all days.
Looking into this now...
I have found and fixed a bug associated with this, and that will be in the next release.