Starting with t:connect mobile app for iOS version 2.8.2, when your pump battery is less than 20% and you are not actively using your mobile app, your mobile app will no longer upload data wirelessly or provide pump alerts and alarms to your mobile app. Under these circumstances, there may be a short delay updating the main graph when you open your app.
To restore connection of the mobile app with your pump and continue normal use of your mobile app, charge your pump to over 20%. You may see a short delay in graph data backfill the first time you reopen the app after you charge your pump to over 20%.