Very high flash memory usage on the BangleJS 2

Ahh, ok, if it's from the info app that'll be storage.

Please can you go to Settings -> Utils -> Compact and see if that fixes it?

Failing that you can connect with the Web IDE and paste the following code in to the left-hand side:

print(require("Storage").list().map(f=>require("Storage").read(f).length.toString().padStart(7)+" - "+f).sort());

It'll list all files sorted by size and you can see what's taking up the space