@literary You're welcome!
If the app stops working mysteriously in a few days, the fix is to grab the new one using TestFlight. A new version just went out to Apple and should trickle through beta review soon.
TestFlight apps are only good for like 90 days (which beats the 30 or so they used to last), so even when there's not much changing, a new version still has to go out to keep the app usable.