Calendar crashes after update to iOS 15.1

Apple Support in the Netherlands listened to me and found multiple reports of the issue, so for sure the issue is recognized now within Apple as related to use of the Calendar with an Exchange account.

The only suggestion was to see if removing my Exchange solved the issue, which I refused as it makes no sense to test with an empty Calendar.

There is no solution yet.

I had the same problem and resolved it as follows:

• go to the iPhone Settings
• Scroll down to "Calendar", select "Accounts"
• Now you see all your accounts (email, calendar, contacts, reminders...) that sync with the iPhone.
• Select those accounts that are either Office 365, or Microsoft Exchnage.
• You will see the list of Mail, Contact, Calendar, Reminders and Notes with the slider that allows or not the synchronization of such piece of info (e.g., Contacts or Reminders or Calendar). "Uncheck" the Calendar and confirm the delition of the data from the iPhone.
• Wait a few seconds and then "check" the Calendar again, this will start the synchronisation of that calendar with the iPhone calendar and if you go back to the Calendar application, it should work (without freezing).

Thank you Wouter. The more affected people contact Apple support and give helpful data, the better it is.

I have just done a diagnosis session with Apple Support, they will forward the data to development and analyze.

Every time I launch the calendar app it takes several minutes for it to allow you to scroll. Many times when you’re scrolling it is sluggish. I am also using Microsoft exchange and from reading some of the post here it looks like that may be the issue.

I deleted from the Outlook Exchange and restarted. Didn't fix it. I'm not surprised since my iPad, also updated to 15.1 has no problem with its calendar, at all. Now I have to take my iPad with me to schedule medical appointments.

Same problem here. I feel noticeable change after upgrading my iPhone XS to 15.1. Is much slower, with lagging screens and calendar is useless. I am very disappointed with software quality at recent updates.

Same calendar problem with iPhone 11. Calendar connects to Google Calendar and Microsoft 365. Both are necessary for my work.

It freezes and crashes. When it works... there is a 10 seconds delay before it can scroll up or down etc. Sucks

I was having the same issue for weeks on my 11 Pro Max and now the 13 Pro Max.

I was just able to fix it by clicking on the “Calendars” after it loaded and then unselecting ‘Siri Siggested’, ‘Birthdays’, ‘Calendar’, ‘Work’ and ‘Home’ calendars. I left the exchange one selected then clicking “done”. It immediately fixed the issue but I verified by closing the app then reloading and selecting the calendars I want. The interface looks a little different but now it loads fine.

maybe this’ll help others fix their crashing and stuck/slowcalendar app.

I saw in an earlier post to go to calendars at bottom, open and uncheck Siri Suggestions, US holidays and birthdays. Close out and see if it helps freezing. Then open back up and check them again. It seemed to help mine. Not sure why, but worth a try until they post update to fix.

Tried removing all other calendars to no avail. Conversely I turned off the exchange account with the problem and ran only gmail and yahoo account calendars (which are not as populated mind you) and the issue went away. I believe as others previously mentioned, that this is strictly Exchange account related, particularly as it pertains to accounts with large amounts of calendar data.

Apple needs to resolve this via bet update.

Yes I did this following someone’s earlier advice. Shame because I have a lot of appointments and like the stacking view.

Hopefully, it will be corrected in the next update so I can get back to how I like it.

_s0z_ wrote:

Make sure the stacking icon is unchecked, this causes the lag and crashing.

The advise to select the day view is like advising to use a paper Calendar.

The weekview or stacked view is what gives value to the Calendar App.

Having the same issue right after backup to 15.2 the calendar freezes up. Did hard reset and still having same issue. With apple service could get their act together to solve these issues. How did you find resolution?

Same here. All this $$ for apple technology, and they can’t get IOS UPDATES accurate. They fix one thing & damage something else that’s critical.

No option correct, as hard reset doesn’t work, had to restore back to factory settings. Now the real work starts reorganizing the apps, adding their user names and passwords etc. Their iOS errors are time consuming and damaged 4 days of my calls scheduling locking me out. Hope they get their act together, as I’m exploring more reliable backups.

I'm having the same problem what do even more so. Even when I use my Mac and go to iCloud.com, login, and click on calendar, events that I have created on either my iPhone, iPad or Mac do not show up in iCloud calendar. If I create an event on the iCloud calendar via Safari the event sometimes shows up on my Mac's calendar app. I've had two support calls with Apple tech and awaiting a call back on Thursday. I'm also pretty sure this started working since the latest iOS update but it seems to be also with the iCloud calendar server as I get errors when trying to open calendar on iCloud.com.

Craig