iPhone is (seemly randomly) switching location to an old address
I recently moved, about 4 miles east. Ever since I moved, my iPhone appears to be randomly saying it's back at my old place. I have a device tracker / logger via "Home Assistant." Here's a graph from yesterday:
Slate blue = new apartment
Purple = old apartment
Turquoise = some random address due west
I have verified it's my phone doing it. When I get a notification I've gone "away," I log into "Find My" (on my iPad) and my phone shows as my old location. I check Apple Maps on the phone, and it shows it at my old place. Often within minutes (each sliver is just a few minutes), my phone "bounces back" home. I also noticed my phone will say I'm doing random activities, such as "Automotive" when I'm clearly at home, not going anywhere, at the most, just walking around the apartment with the phone.
Has anybody seen this? Any idea what's causing this? I've tried resetting "Privacy & Location" but that doesn't work. It's like my phone is "caching" an old home address, but I can't figure out why or where. When I moved, within my Contact card, I renamed my old address to the year(s) I lived there, and created a new "home" entry. Apple Maps does correctly show "Home" as my new address.
iPhone 11 Pro Max