Sensi touch thermostat keeps overcooling

Sensi touch keeps overcooling

I have a Sensi Touch at home and it's great and keeps a consistent temperature at my set point.

But I installed one at my office and it overcools by 3 degrees before it shuts off. Then it comes on as expected when the temp creeps back up to the set point. My old thermostat, which was not a smart one, held a consistent temp.

I thought maybe I got a lemon, so I exchanged it. The new Sensi Touch does the same thing.

In settings, cycle rate is medium, dehumidification is off, A/C protection is off, and no temp or humidity offsets are set.

I called tech support Friday and was on hold 55 minutes before it hung up on me. I called today and it just clicks, no one answers.

Thoughts?