Hello Jeffreyln,
Yikes! An unexpected change in the Nest Thermostat temperature is never ideal. But I'd be happy to shed some light on your situation with temperature change.
You might want to check your thermostat's temperature schedule and remove them. Then, make sure to disable the auto-schedule, which causes it to adjust according to what it learned from past usage. Also, if you believe that you are enrolled in Rush Hour Rewards, Please reach out to your energy provider or contact us to help you unenroll from the program.
Let me know if you need more help.
Thanks,
Mark
