StopCOVID NI
Google Play
The app does not seem to work correctly unless automatic battery optimisation is switched to manually allow app to run in background. Settings -> Battery -> App launch -> StopCOVID NI. Might also be under Applications -> StopCOVID NI -> Battery Optimisation depending on version. Once I switched this I went from 5 checks over 10 days to 8 checks in a single day.