A. Ensure that the app is updated to the latest version. Go to the App Store, search for snd.wave, and check for updates. If an update is available, install it and check if the monthly stats feature is functioning properly.

B. Try resetting the app's data by going to Settings > General > iPhone Storage > snd.wave and selecting 'Delete App'. Reinstall the app from the App Store and set it up again to see if the monthly stats feature works.