Birthday calendar duplicated hundreds of times on iOS 10

It's nice to know I'm not the "only one" but it does feel a little frustrating that I've been hassling around with this calendar issue for months. I've done all the suggestions and nothing took away the excessive calendars that just seemed to duplicate and multiply daily. I'd uncheck them but my phone is constantly locking up and I even transfereed the issue over to my new iphone7...I'm so bummed that Apple hasn't found a bug fix for this. I think this issue is bigger than it appears, just most people don't know it's doing it. I just downloaded the suggested decipher backup tool and praying this the the fix. Thank you all for the thread of support.

I can confirm that iOS 10.2.1 does NOT fix this issue. Apple is fast asleep doing nothing to fix this bug. I've grow irritated enough to blow up the phone and start as new. I refuse to pay someone else to fix this.

I have iPhone 6 and mid september did the upgrade to 10... since then I have 18000 + dulicates of the same note ( linked to my personal gmail) and hundreds of facbook birthday calenders been to 2 genius bars 1 in Ireland 1 in UK both said they'd never heard of the issue!!!!!!! This is causing huge battery issues and over heating...

Applecare have confirmed via phone there isnt a issue with my battery

Has any bug fix been found as I cant un check any calenders via iPhone as they are all frozen ... infuriating to say the very least

Linda

Apple likes to pretend the problem does not exist and it is user error - I doubt very much they will ever fix it. It's below priorities like releasing ridiculous emojis with every update or fixing stuff that I didn't even know was broken or will use.

I got this from Apple support just now so at least they finally acknowledge.

Thanks ewmiller, am just in the process of updating to 10.2.1 now, and was wondering if it would actually fix it.

It'll be interesting to see if 10.3 has anything for it.. though i'm not sure i'm willing to try the beta to find out.

While i'm still steadfastly in the "Apple should fix it soon" category.. i'm getting closer and closer to just buying/using the backup editing solution with each passing day..

I've done the update to 10.2.1 an unfortunately no change.... problem seems to be linked to google contacts/facebook birthdays and iOS update.... every time the phone syncs it duplicates the calender... i've un checked so many things from so may applications on my iPhone and from Macbook and google account and face book that I'm dizzy. Have downloaded google calender but same problem ...HELP!!

Linda

I can confirm that the iOS 10.3 Public Beta DOES seem to resolve the issue.

Prior to downloading the new beta, I was running iOS 10.2.1 on my iPhone 7 Plus and had hundreds of duplicated, but empty, birthday calendars. I tried all the usual fixes of deleting iCloud account, resetting and restoring backup from both iCloud and iTunes, etc. Nothing seemed to work, but it seems that Apple has FINALLY addressed this bug with iOS 10.3. Fingers crossed!

I've triedt this, and, at first, I thought it fixed the problem! But a few days later, the calendar bug returned. So... despite they are very nice people and committed to helping their costumers, the problem remains with no resolution...

This is not the case. I have literally tried everything, up to and including installing this update (10.3 beta 3), erasing my phone entirely and restoring from a backup, etc. Can you please detail the process that you took to repair your device?

Having the same problem. I noticed my notes duplicating MONTHS ago...Then my calendar started duplicating the birthday calendar well over 100 times before December. I have not been able to use my calendar on my phone and without extreme patience. If I am super lucky and am able to schedule something on my calendar (very rare) it does not synch to my calendars. I don't want to delete my calendars and lose my appointments - not that I can see them until the 10 minute alert anyways. I do not want to lose all my information and am struggling to use my phone in general. I almost went and bought a new phone, but very happy I searched one more time today before wasting my money. Will I lose my appointments if I delete my gmail accounts? I will try the 10.3 beta, do I just download that from a website on my phone? Desperate to have a calendar back, I live and breath by it and have started carrying a PAPER calendar around again because I can't carry my ipad arround easily. It's made for an extreme pain for wedding planning and I've missed several things.

So, after doing EVERYTHING myself and Apple could imagine (you name it), I've "fixed" the problem. The solution? Format my iPhone SE and start using it as new.... which *****, of course. Had to download all apps (printed them before), reorganize them, login etc etc. The photos were ok cause it's everything in iCloud. Whatsapp, I've also backed it up before.

Today, the only calendars I have are the iCloud ones, the birthday one (finally, just one!), holidays and "events found in apps". Also left the Notes app with only iCloud. My email acounts: no calendars allowed. Nor Facebook.

So, after hours and hours of talking to Apple Support and doing all the imaginable tests, it's over.

Update: 10.3 beta 5, combined with the Decipher Tools solution mentioned previously (https://deciphertools.com/blog/birthday-calendar-duplicates-ios10/) works temporarily for me. However, once a day or two passes, the calendars start duplicating themselves again. This is getting tedious - an Apple representative needs to chime in here to update on where they're at with a permanent fix for this. I've been dealing with this issue in some form now for more than a year, and I'm nearly to the point where I want to divest myself of my investment in Apple devices and head to something more stable.

Hi, do you have any update regarding this issue?? I've opened a same case to Apple Support, but even restoring my iPhone with iTunes, I still have all these Borthdate calendars duplicated... this is really frustrating...

I have this calendars bug and also the fact that the iCloud Cal will sync down to my iPhone from my Mac, but not up to my Mac from my iPhone. Tres dull.

It looks like I might have found a solution to speed up the calendar on my 6S. This doesn't remove the birthdays, but it did help.

I went to Settings>iCloud and then turned off contacts, reminders, and calendars, and then delete from device.

Then if I go into the calendars app and click calendars at the bottom, it brings up a load of calendars 'On my iPhone', which I can now delete. Calendar will crash after about 15 deletes, but just keep at it and eventually you will rid yourself of loads of extra calendars that your phone has made.

On my phone it had also generated an equal amount of blank reminders in the reminders app. I didn't delete all of these because it was taking far too long.

My Calendars are now syncing again and the app seems much happier.