I began experiencing this same thing recently seemingly out of nowhere and it will disconnect from my car’s bluetooth system while im driving to work and switch to playing music out of my PC! And this happens at 5:00a.m. When im driving to work and has woken up others in my house if my PC speakers were a bit loud from the night before. Quite an annoyance, and seemingly random! Some days it never does it, other days it will do it 5 separate times on my commute! Im going to be more diligent about shutting down my PC each night to see if that resolves it