Speaker Volume defaults to Min on Connection

Hi, I've got a new Sony headset (WH-1000XM4), I previously used the WH-1000XM3 without issues.

I'm finding that when I connect to zoom the speaker slider defaults to the min setting, each time I move it up have my meeting but when I join a new meeting where the headphones have been turned off (they auto turn off after a few mins) the slider is at zero again.

How can I get zoom to remember the previous setting? 

Any help will be greatly appreciated.