When none of the above approaches is helpful to you, you should think of retrieving deleted calendars or reminders from an iTunes or iCloud backup. If you have recently made a backup before your calendar events or reminders got lost, the backup may contain the missing calendars or reminders you want. Thus, you may restore the backup to your iPhone to get the data back. However, here are a few points you should pay attention to:
Creating, setting and scheduling reminders on your iPhone can help you a lot in getting yourself be reminded at all times about any important activity you have for the day. But what if one or all your reminders suddenly went missing from your phone?
Wait for the process to complete and ensure that your device is charged enough. Once your device gets updated, your iphone calendar alerts/reminders not working issue probably would have been resolved now.
If you set up automatic backups in iTunes (or Finder), any time you plug in your iPhone to the computer, you should get backup of the device. You then can restore the backup in iTunes and get back missing reminders to iPhone. Here's how to restore from iTunes.
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@MelkizadechAnother behavior I just experienced today is that I have two tasks within the same task list, each with reoccurring reminders, one at 8:30am the other at 9am. I only received the reminder for the 8:30am task. Very bizarre and frustrating as I've been missing important reminders.
I use reminders to remind me of recurrent tasks. But sometimes, the reminder of the task just gets disabled (the bell icon is crossed), randomly, and I don't get notifications for that task anymore. I have to go into the task, and reset my reminder.
If you're not already using location-based reminders, you are missing out on one of the coolest features of the Reminders app! Location settings in Reminders can help you remember things based on when you're next arriving at or leaving a location, so you won't forget to pick up milk next time you're near the grocery store, for example. We'll show you how to use this handy feature.
I've had this problem too, but have been waiting for a fix. got an update today today and it's still not fixed, but I note a possibly different problem with the alerts. Seems an alert gets posted at the same time the event starts minus the number of days or hours the reminders were set for. I'm running Manjaro Mate with the option to have multiple desktops available to me. When the Alert happens the popup arrives in the Virtual Desktop I'm using at the time. If I'm in a Desktop that IS NOT the same one that Thunderbird and Lightening are in, it pops up in that window. Usually I click on the left icon at the top of the Alert window and "move" it to the Virtual Desktop contains Thunderbird. If I switch to the Desktop, the Alert will be there. However, if I then move to another Virtual Desktop and then back to I put the Alert, it will be gone. It also seems to have the same failure if, by chance I was working on the same Virtual Desktop that houses the Thunderbird window, move to another Virtual Window, do some work on it, then return to the Thunderbird containing Desktop. So it appears the loss of an Alert might be a function of switching Virtual Desktops. 781b155fdc