Audition randomly closing down (NB: not crashing - it asks if I want to save open file)

Machine: MacBook Pro 16' (2019), 2.3GHz 8-core i9, 32GB RAM, AMD Radeon Pro 5500M 4GB

OS: macOS 10.15.7 Catalina

Audition version: 13.0.12.45

I have this weird problem where if Audition is open (and a multitrack session is open) and I'm not recording, or working with the app for a few minutes, I come back to it to find that it's in the process of closing itself: a 'do you want to save changes?' dialog box is open.

If I click 'yes' or 'no' then changes are saved (or not depending on which of these options I select) and the app closes, even though I have made no input to it, much less CMD + Q or anything remotely similar. Pressing 'Cancel' doesn't work because the dialog just reappears each time I press it. I'm usually connected to power when this happens, but it's happened on battery power as well. I've noticed it happening for a couple of weeks now, and it's extremely irritating!

1) is anyone else experiencing this weird issue?

2) Anyone know what's going on?

Thanks in advance for any insight you can provide.

Francis