Single-day glitch generates many duplicate events in Calendar on iPhone 4

The Calendar app on my iPhone 4 was working just fine … until the latest sync.
Then October 21 — just October 21, as far as I can tell — turned up with many, many duplicate events. These were all blank "New Events" with the time starting at 12AM on October 21, 2014, and running through 7PM on December 31, 2000 (yes, 2000). The ending date and time has a strike-through line.
October 21 in iCal on my MacBook looks just fine. So I re-synced, but the iPhone problem persists.
I figured that since the problem was just on this one day, I'd try to manually delete these useless events. But when I did that, they started multiplying!
Has anybody else run into this?
Suggestions welcome. Thanks.

The reboot cure-all has cured all. :-)

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I upgraded my iPhone to iOS 5. My computer has OS 10.6.8. I started iCloud for only three apps; Contacts, Calendars and Find My Phone. After looking around some, I realized that with iCloud turned on for Calendars, it would only sync with iCloud and warned that "syncing with the computer could cause duplicates". Well, syncing with the computer then caused duplicates calendars, one set "From My Mac" the other "From iCloud". So I deleted the iCloud accout from the iPhone and deleted ALL Contacts and Calendars from the online iCloud account. I did restart the iCloud accout at that point but only for the "Find My Phone" feature.
Now after syncing my iPhone every ALL DAY event shows up in triplicate and every TIME SPECIFIC event shoes up in duplicate.
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Ok, so Apple still has not called me back, and I haven't had the cahnce to call the either.
I may have fixed my issue though. Everything appears to be showing up correctly in all my calendars (iMac, iCloud, and 2 iPhone 4's). Here is what I did... oh and BTW I was only having issues with my calendar so what I am about to share is for calendars only and worked for me (who knows if there are additional issues and if it will work for you as well). For my situation iCal was already showing all my calendar events correctly and had no duplicate entries.
1a. MOST IMPORTANT STEP!!! the calendar on my iMac, which has always been my main one, was showing all the events correctly. I saved EVEYTHING by exporting each calendar to my desktop.
1b. MOST IMPORTANT STEP #2!!!...ok so I forgot a step and had to come back and add a 1b...good thing I re read my post before submitting... Make sure you disable the automatic sync between your iPhone and iTunes. If you do not you will have to start from the beginning as this process will not work.
2. I logged on to iCloud using Safari (like I was accessing it away from home) and created a new blank calendar. Once I had created the new blank calendar I deleted every other calendar that was there. The reason for this is that iCloud will not let you have no calendars (neither will iCal for that matter). You need to get iCloud back to the beginning when there were no calendar entries and this is the only way to do it.
3. With all the information deleted I turned on iCloud from my System Preferences panel on my iMac. This asks me to Merge all my data. I wanted to merge all my calendar data because I have just finished deleting everything in step 2 above.
4. With everything merged into iCloud I verified that there were no duplicates...there were no duplicated in the cloud or on my Mac...so far so good.
5. With that step completed I logged out of iCloud (in Safari) and I broke the connection to iCloud by logging out in the System Preferences panel. Merging you data with iCloud will delete all the resident calendars on your mac and make the iCloud the #1 location so when you log out from your Mac in System Preference it will delete all your data from iCal on your Mac. This is ok for 2 reasons...1 you made a back up of all your calendars in step 1a above and 2 all your calendar info will still reside in the cloud. Check to make sure all you calendar info is gone (Birthdays will still be in there is you have enabled that subscription...that seemed not to matter in my case)
6. With all your calendars removed connect your iPhone to you Mac. Once connected check off the option to replace your calendars on your iPhone with the calendars on your Mac. This will overwrite all the calendar information on your phone with nothing. This is good.
7. Once the sync has completed check you iPhone and iCal to make sure that they are both blank. Both might have a calendar showing up in the list as they have to have 1 calendar...this is ok as long as it is blank.
8. Disconnect your iPhone from the Mac and go into Settings on your iPhone. Select the iCloud option and log into iCloud. IMPORTANT STEP!!! When your iPhone asks you to Merge your calendar data DON"T!!!!! The calendars located in iCloud will still populate on your iPhone (it just may take a few minutes depending on how much info you have)
9. If you have more than 1 iPhone this is where you repeat steps 6-8 with your other iPhones. My wife has an iPhone 4 with the same issue as me so I completed steps 6-8 on her phone and the calendars displayed correctly.
10. Once all your iPhones have been synced to iCloud and are not showing any duplicates you can go back to your Mac and in the System Preferences log back into iCloud. For some reason iCloud on the Mac only lets you Merge or do nothing at all, so you will have to merge your data. After I merged my Mac back to iCloud all my devices appeared to be showing no duplicate calendar entries.
YIPPEEEEEEEEEE!!!!!!!!!!!!!
I hope this helps anyone with the same issues as me resolve them. If you don't have the sae exact issue I hope it gives you some ideas to try and fix your problem. It doesn't appear that Apple really cares.
Hopefully Apple will read this thread and make change so this does not happen to other users in the future. At the very least provide some step by step instructions so users know where to start and how to avoid this issue.
Just for fun (because I love wasting my time messing around with harward and software that doesn't work properly) I decided to disable iCloud on my iPhone, and wouldn't you know it all my duplicates reappeared like magic. Either a huge oversight on the part of Apple or a brilliant play to force everyone to keep iCloud. I am going to go with the latter because Apple has some really intelligent people working for them.
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