Hi! I have the whole "sneaking problem" with my teenage Sim. It's really annoying, it all started when my Sim was grounded by her Grandmother for not going to school, but when I tried to get her to go, the Grandmother wouldn't let her. I made the teenage Sim go to school anyway, but she never stopped sneaking... I don't really want to do the whole boarding school tick, as I've been trying really hard to have my Sim get a grade "F" - is there any other way to stop the sneaking?
my sister had the same problem, but she googled it and one of the suggestions said to send them to boarding school and bring them back home and it worked, she's totally fine now. it's annoying and inconvenient, yeah, but at least your teen will stop creeping you out!