Location of the Bluetooth module on a 2018 Accord hybrid

So I've been having issues with Bluetooth since I got the car 2.5 years ago. I can be connected fine then go into a store and turn on the car again and it won't connect. If I turn off Bluetooth in the car then back on it usually connects but it has issues about 50 percent of the time. I've talked to Honda and they've actually replaced the head unit but nothing changed... My question is: where is the Bluetooth module? If it's in the head unit then it got replaced but I know in other cars and earlier versions of the Accord that it was separate. If it's separate then replacing the head unit would do nothing. Anyone know? Thanks!