Every so often I hear a loud muffled Netflix opening sound in my attic?

The first time this happened I was sitting on my couch around 9am which is located in the center of my house with the bedrooms off to the side. The house was very quiet. My 1yo cane corso also heard it as she popped her head up in the direction that I heard it as well. My bedroom TV was the only device that it could have logically been and only 10’ away behind a half open door. TV was off. Took me less than 10 secs to check. Looking around the rest of the house quickly there were no devices that could have even done that. The only other TV capable was right in front of me on the couch. Also off. The thing is, this was loud. Muffled, but loud. Like, big screen TV loud. Here I am today sitting on the same spot of the couch and boom, I hear it again. I do the same checks. Half open door to the bedroom TV off. When I first heard this I immediately thought it could have been my attic and scared to check it alone I discretely made sure to do things to the entrances so I could see if anyone was coming and going. Weeks go by with nothing. Here I am again around the same time of morning wondering what in the hell am I hearing. It is so obviously Netflix turning on somewhere in my house. I did have an issue with raccoons getting into my attic and you could hear them fairly loudly up there. That resolved itself since I’ve gotten a large dog that patrols the yard. I would like to think I could hear a person up there but maybe not a quiet clever one. I’m going to get someone to go up there with me. And I’ll post what happens.

Edit: What happened https://www.reddit.com/r/homeowners/s/qDL97CzfrW