Hi Chris,
yesterday I updated the backend again with more fixes, and released a new version of the app to the Play Store, with many upgrades, removed ads, removed in app purchases, etc.
The previous version of the app will not work correctly with the last version of the backend, because of that, make sure you have the version 72 of the app (you can check the app version it in the contextual menu, info section).
Eventually you will need to erase all the app data and start from skratch, or maybe uninstall the app and install it again.
Please let me know if the app is working better now.
Regards!