Do you also have these sound level bugs with your XM3, where you adjust down the volume before connecting and then the headphones adjust the volume back up to some level when connected? This has severly blasted my ears multiple times and I can't express how angry I get when that happens (its a miracle I didn't destroy them yet). Its just a shame they combine so good battery life, ANC and sound quality with such a bad software, to a point where I rather get mediocrity in all points than what sony is offering me. Since I got my AirPods Pro I rarely use the XM3s anymore so I will probably not directly jump for the Maxs but they will definitly be an option for me in the future
I think that's a case of the OS you're connecting to having a separate volume setting for Bluetooth headphones and the built-in speakers, at least from my use with an iPad that's how it works.
If you adjust the volume down prior to connecting, you're changing the speaker volume. When you connect to the headphones, it connects them at the volume you previously had used with the headphones. And when you disconnect, your speakers go back to the level they were at before you connected the headphones.
I've never seen them jump higher than my previously used setting.
Might be an iOS issue, but for me its even happening when I connect them, turn the volume down and then start playing something. The instant it starts playing the volume is adjusted up to some previous level. This has never happened to me with other bluetooth headphones / speakers
