Apple wallet pkpasses are receiving too many updates

The app I worked on got an alert from apple wallet: "Some passes are receiving too many updates, which may affect battery life. Automatic updates for *** passes will be disabled. Choose RE-enable if you want automatic updates to continue." I only have 2 passes in the wallet from that app. Does anyone know what's the reason trigger this alert? If we send 2 push notifications within 5 seconds, will that trigger this kind of alert?