My ex did all kinds of weird crap in blackouts. He never had any recollection later, and of course always denied being drunk. He'd put something in the oven and leave it on all night, pack up a big bag of stuff and throw it in the crawlspace, he smashed the cat tower with a baseball bat because he thought it was an intruder in the house and put dozens of holes in the walls with his fists because he thought someone was attacking him.
I think he has Korsakoff's dementia on top of the many brain injuries he's suffered. He also loved lighting fires in the backyard. The neighbors used to call the FD until I built a firepit out of some old cinderblocks his hoarder dad dumped at our house.
Maybe you could get a PO box for important letters/bills.