Losing My Mind - iPhone Connection

I can't for the life of me figure out why my car won't automatically connect my iPhone. It does it about 10-20% of the time. I can literally get out for two seconds, leave phone in car, hear music playing, come back in, close door and it will disconnect and not reconnect. The few times it automatically connects, it will take a minute or two of driving. Doesn't matter if my phone is locked or unlocked, playing music or not. I have experienced this across three phones now. Yes, I have deleted the phone key and my user profile and yes it's a priority device and all of that. Open to new suggestions and ideas here. Current phone is iPhone 16 Pro Max.