This is a duplicate of Failed to execute 'transaction' on 'IDBDatabase': The database connection is closing and appears to be a bad state that Enketo can get in, possibly related to Internet connectivity.
Thanks for sharing your device details, @krisknut. For anyone else who runs into it, it would be good to know:
- device, browser versions
- offlineable form?
- was your Internet connection particularly unstable or off before it happened?
- does refreshing get things working again?
