500 alerts error. How to fix

“The 500-alarm limit dialog or notification appeared.”
“Some repeating reminders I set stopped going off.”
“The app started crashing.”

Root cause of this issue

Many devices have a system limit that allows only up to 500 alarms to be scheduled at the same time. For example, if you set 90 snoozes for several reminders and also enable multiple advance notifications, the number of active scheduled alarms may exceed 500.

How to recover from this error

・For reminders scheduled to go off soon, delete any reminders that use a large number of snoozes, or edit them and reduce the number of snoozes and selected advance notifications, then save them again.

・After reducing these settings, go to Settings → Repair Robot and tap the Repair Alerts button.

If you still get an error at this point, it means you still have settings that would cause close to 500 alerts to go off within the next 3 weeks. Reduce the number of snoozes and advance notifications scheduled within the next 3 weeks so that the total falls below 400.

・If you are certain that you have reduced the number to below 400 but the app still crashes, try restarting your device.

Conditions that can cause this error

・In general, this error may start occurring when more than approximately 450 alerts are scheduled to go off within the next week, including snoozes and advance notifications.

・For example, if one reminder has 90 snoozes and all 15 advance notifications selected, that single reminder counts as 105 scheduled alerts. If it is also set to repeat, it counts as 106. If you duplicate that reminder 5 times, an error will likely occur when you try to set the fifth one.

・This can also happen with reminders scheduled more than one week away. For example, suppose you have a reminder scheduled for 3 weeks from now, with an advance notification set for 2 weeks before and 90 snoozes enabled. This reminder will also count toward the active alarm limit because its advance notification is scheduled to go off within the next week.

・Once an alert or alarm goes off, it is released from the active alarm count.

In general, there is no problem with having more than 500 reminders saved in the app. Most of those reminders will normally be scheduled for dates more than one week away, so they will not count as active alarms. The main cause of this error is setting an excessive number of snoozes or advance notifications.