App keeps shutting down

We have a decent number of identical apps (not instances of one app, but different apps with the same Dockerfile) and just one of them keeps stopping every week or two. The instance becomes inaccessible, logs show it was maybe kinda working but is waiting on a reboot? Grafana shows it had memory and cpu and concurrency of 1 and then it just suddenly all goes to 0 / stops. I have to manually run flyctl apps restart and then it comes back.

Any clues about what I should look into here?