My Landlord Showed Up Unannounced Again And I Don't Know What To Do Anymore

Location: Oregon. I've been renting the same apartment for about 3 years now and overall it's been fine, but my landlord has this habit of just showing up whenever he feels like it. Last week he knocked on my door at 7pm on a Tuesday saying he "needed to check the smoke detectors." I let him in because I panicked and didn't know if I had a choice. Then yesterday he showed up again with no notice at all, this time with some guy he called a "contractor," and they walked around my kitchen and bathroom for like 20 minutes pointing at things and talking quietly to each other.

I have no idea what they were looking at or why. He didn't tell me anything beforehand, just texted me literally as they were pulling into the parking lot saying "heads up coming by." I looked it up and Oregon requires 24 hours notice except for emergencies, and neither of these visits sounds like an emergency to me. I've never had any issues with rent, I always pay on time, and I've never damaged anything. What I'm worried about is that this contractor visit means he's trying to sell the place or renovate and he's building some kind of case to push me out. Is there anything I can do to formally document this and protect myself? Can I send him a written notice telling him to stop or would that make things worse? I don't want to escalate unnecessarily but I also feel like my home doesn't feel like my home anymroe and it's making me really anxious. Any advice would be appreciated.