I recently installed a pair of DL110 locks and was receiving a notification on my iPhone on each manual lock/unlock of the door. After a few weeks I noticed I was no longer receiving notifications on either lock. On a whim I removed/inserted the battery. Sure enough, both started sending notifications. Things were fine and then a few days later - notifications again stopped. A superficial peek at the logs on the locks seem to show activity. I'm logged into the app on two devices (iPhone and iPad), and both stop receiving notifications. The settings within the app to receive notifications are enabled.

Any ideas what is going on? That it is fixed by a reboot feels like some type of memory/buffer exhaustion.