High Data Usage

Anyone else experience high data usage after commercials aired on TV advertising unlimited data option?  I have been a Xfinity customer for over 14 years and have never gone over my 1.2TB of data.  I have paused all devices, reset the modem, etc. Somehow I used several GB overnight while asleep.  I have checked in the app and all devices connected are mine.  I can’t help but feel that this is a way for xfinity to make customers switch to the unlimited data plan and squeeze extra money out of long time customers pockets.