DaVinci Resolve 16 crashing when saving project

I have a project which is currently about 20 minutes long, with two short (30 second) fusion compositions amongst a load of edited video (1280 x 720 HD 720P, 24fps).
I have been saving the project as incremental versions to provide safety-backups, and about four versions back DaVinci Resolve began to start crashing every time I save the project as a new version.
When DaVinci Resolve has been re-started and the prokect re-opened, it seems to play fine, but then I get further crashes when I continue to "Save As" my work.
I am running DaVinci Resolve 16 (16.2.8.005) on Windows 10 Pro (version 20H2). I do not have any external control surfaces or hardware connected.
I have been saving the project as incremental versions to provide safety-backups, and about four versions back DaVinci Resolve began to start crashing every time I save the project as a new version.
When DaVinci Resolve has been re-started and the prokect re-opened, it seems to play fine, but then I get further crashes when I continue to "Save As" my work.
I am running DaVinci Resolve 16 (16.2.8.005) on Windows 10 Pro (version 20H2). I do not have any external control surfaces or hardware connected.