when i get in the truck, my phone likes to connect via blue tooth, but, the sound quality of playing music that way absolutely sucks! It's amateur. If i have my phone plugged in through the USB cable, the sound is amazing, but you might as well flip a coin when you get back into the truck if it will reconnect or if it will say audio system is off... what is up with that?!!
Bluetooth audio sucks. I don't think that is unique to Toyota's head unit.