iOS 15.1 Calendar app is laggy and unreliable

The part the really stinks is the data overlapping when swiping between days. I can’t tell what’s real and what isn’t. I have to touch the actual meeting for it to refresh or close and reopen the app. At least if the data was correct and it was just laggy it wouldn’t be as bad. Also, it does appear to be some cache issue. In list view when scrolling into future dates it lags, but if I scroll back up and then back down it’s fine until it gets to new data and it starts lagging and refreshing. I don’t care how big the calendar data is, this worked fine until 15.1.

I have found that Calendar is now sucking huge amounts of battery in "background activity" - it used almost 3x as much battery in 30 minutes in background activity as the same time I was actively scrolling through FB (72% vs 27% respectively) - that 30 minute period equated to over 20% of total battery charge drained...

Here's what Apple support just told me:

Hi CUSTOMER,

Thanks for your patience. I received an update about your case. I tried to contact you by phone but was unable to reach you.

Our engineers let us know the issue is currently under investigation, but they do not have a timeline for the resolution so it could be days, weeks, or even months. We recommend keeping your devices up to date in the meantime and please let me know if anything changes. When I hear back with a workaround or resolution I will let you know.

Thanks,

NAME

Apple Support

I gave up after 3 calls with 'senior ' engineers. They asked our exchange team to get in contact with them as the problem (with their failing calendar app) seems to be on our side. what a joke.

they don't care or have the right & competent people. never seen such incompetence in support processes. @apple check bug report which I failed immediate after IOS 15.1 release > FB9724066

I'm really frustrated about apple.

iPhone Xr here, 15.1. Also kicked out Exchange and reconfigured. Nothing changed.

As this is my Company iPhone, I am not able to use the phone right now. It is really important for me, as I can look for changes to meetings and scheduled task in general.

It is a shame, that no one is responding to this. As far as I know, there is no workaround for this.

If I accept a meeting that is a series, the acceptance mail is send out multiple times also. A colleague of mine is having the same issues. I have to now switch of the phone to stop the sending out of the acceptance mails.

Unbelievable...

That is hilarious. My company IT dept demanded that we all update to 15.1 as the earlier OS "had security risks". And in fact they said anyone checking email from iOS 14 would then be blocked until updating to 15.

Having regretfully done that I am now faced with an unusable calendar! And I cannot even rollback via iTunes as Apple has stopped signing 14!

This is pretty shambolic.

Thanks this is so helpful. I feel like telling my apple tech in triumph.

there’s obviously still something not quite 100% about it as the calendar still has a barely perceptible visual glitch on some of the entries if you stare at it.

This fix of deleting the app and reinstalling did not work for me. I went through this with Apple Support and still still the same issue post reinstall. Lots of lagging, crashing, appointments all off, etc.

Has anyone submitted a bug to the MSFT team on that? I use no on prem Exchange, only 365 so it clearly also cuts across MSFT 365 Exchange servers, which run the most recent Exchange versions and updates

Totally agree. Proper poor testing and customer quality. I had a previous upgrade that actually destroyed my phone and after asking apple for a new one as it was clear they caused fault - they still charged me! Unreal

There’s clearly inconsistent responses here which proves apple have not fixed the problem. Does anyone know how we get this highlighted in the public domain? Apples arrogance of not recognizing the crap they have caused should not go without some pain. 15.1.1 should have been focused on this issue instead of some other menial problem. Not impressed at all.

Ive actually spoken to apple support twice over the past week. They are clueless!!

no idea about problem, no clue how to fix and no clue about next steps!

and they are supposed to have one of the largest knowledge pools! No chance.

how do we give apple some bad press about this??

Strange now is that my iPhone 6s does not get IOS 15.1.1 offered, while it is announces since a few days.

Before it got updates offered very short after Apple published the release notes or even before.

Anyway, the Calendar issue persists.

I have just spoken to the third apple support clown who has said the engineers are blaming this issue in work profiles put in calendar!! Fuming. I have already removed my profile without any change yet apple are using this ******** as an excuse for their problem.

does anyone know how to remove latest 15.1 and revert back to previous version?