Reports suddenly stopped working

Hi,
I have an app that sends out a report on mondays and thursdays and I recently noticed I havent been receiving these emails anymore even though I havent done anything to the app. The app has been in use but this is a “behavior report” so I dont think any user disabled it somehow. . .I dont know if theres a way to disable it from within the app, but the reports just stopped coming. After checking my inbox I found out that its been almost a month without these reports.
They were working fine for 3 months and then suddenly stopped.