Philly,
We thought the maid was raising our temperature, too, before they explained the motion sensors to us. I just figured because it said 77 when we came back into the room each time that the maid was turning the A/C down. I asked housekeeping to please stop doing that and that's when they explained the motion sensor to me.
The more I think about it, I just stayed in a GF dormer room 1 month ago, CR Tower in May, and AKL in April. I never had any problems there, so if there was a motion detector, it may have been just set differently (again, because my brother had no problem in his GF RPC room). The other thing I wondered about is if it has to do with the afternoon sun and what side of the building you're on. Maybe all our rooms at GF RPC just faced the afternoon sun which made it warm up a lot quicker.