I bought a 16 pro for my wife and a pro max for myself, both 1TB. My wife’s phone has zero Bluetooth issues while my pro max has Bluetooth Tx issues on multiple receivers.
While listening to music on my Bluetooth receiver, the audio cuts out for about 10 seconds and then comes back… constantly. Also when making calls in the car using CarPlay (two different vehicles), after a minute or two, the person on the other end of the call cannot hear me while I can hear them. I have to quickly change to speakerphone back to Bluetooth every couple minutes. My wife’s 16 pro does not have these issues using the same devices.
I thought my phone just had hardware issues and got Apple to replace my 16 pro max. Now I have a different pro max and it has the same issues! I don’t know how or why the Bluetooth functionality would be different between the 16 pro and pro max but it certainly is and Apple needs to fix this.