Are you on testflight? I've just added a new option to clear/manage cache at the bottom of Settings/General, so you could test that (still an experimental feature though)
Yes. I set it to 4gigs to see how fast it fills up and clear it. Will report back. I thought I set it to 4 yesterday, but noticed it was at 2gigs. Since yesterday, which I used the app for hours, it only filled up ~260mb. Whatever the issue was though, it seems to be resolved.
I do appreciate the work you do and quickness in creating a solution.