Bluetooth Lag On M1 Max MacBook Pro

Hi,

We're experience severe Bluetooth lag on the M1 Max MacBook Pros - we have 2 in the office. Basically everything Bluetooth connected is lagging. My Apple Magic Keyboard is lagging while I am writing this message - there's a significant delay between key presses and it being input on the screen, same with the Apple Magic Mouse 2. A connected Bluetooth speaker is also lagging the music that's playing - though it isn't constant, I'd say a good 30-40% of the time the sound is stuttering, as are all other Bluetooth peripherals (apple magic keyboard, Magic Mouse).

We have 2 of these machines and they both experience this.

This wasn't case on the previous Touch Bar MacBook Pros we had - those did manage with 3+ connected Bluetooth devices without an issue.

And before someone asks - it's not the screen. There's no stutter or lag when the built-in keyboard and track pad are used on the MacBook.

Any clue?

Many thanks.