Call TAPs.
Are you doing remodeling? Any subways, trains, A DUH thing, but when De was on Effexor she did paintings, put the heat up, empty drawers looking for something unkn. Locked a cat out of the house, never knew she left her out.
Ambien did the same thing....she would make food leave on the stove.

I like the ghost story better. They are not very subtle, strange?
do you have a tape recorder you could leave on? Video?

In Ghost Hunters TAPs advises the home owners to sit down talk to the ghost and take back the home.
Can you research if there was a previous owner that passed away?

Oh, Bizi one last thought, neighbor kids breaking in and pranking. We actually had one woman had a guy living in her attic for weeks. Finally a slight ajar closet tile and food disappearing the police found the guy.

hope you can take back your home.