Find me follow me calling issue

I have ext 100 set to find me follow me to my cell phone. Every night, about 10:30pm EST and 2 -3 times during the day, I get a call from my extension showing my caller ID. When I answer it it hangs up immediately. I don’t have wake up calls set. Not sure why I keep getting calls. If I delete the find me folloe me it stops.

Any ideas?