My iPhone 6+ keeps rebooting after installing iOS 8.3

I have a 128Gb iPhone 6+. When I downloaded and installed iOS 8.3 via WIFI, it went through the usual download sequence and then started continually rebooting. After about 20 or so reboots, I got a white screen with a carrier signal on the top left, a location icon and a grayed-out bluetooth icon and the battery level indicator on the top right, and a curious "information" icon (a letter "i" in a circle) at the bottom right of the screen.
I tried tapping on the "i" but got no response. Then the iPhone went into the reboot cycle again. After several reboot cycles, I got the same white screen again. Then the iPhone again started rebooting and hasn't stopped.
My iPhone 6+ has been problematic since I installed iOS 8.1.2. Several random reboots (about 4 cycles, before the iPhone returned to "normal") and some other issues that I didn't document.
I brought the iPhone to the nearest authorized Apple repair center. They said that they could not find any problem and neither could they duplicate the issue I experienced. They recommended that the next time reboots happened that I should make a video of the error. Also, they recommended that I keep all of the apps updated (which I conscientiously do). So I decided to make a log of all the errors since the iPhone was returned to me.
Here are the entries to my log:
iPhone 6+ Errors since March 30, 2015
218 apps not synced
Failure to Sync - 0xE800002D - The app was not installed on the iPhone because of an unknown error
iPhone self reboot during reinstallation of 218 apps not synced
Missing Google Authenticator settings.
AutoSMS app could not be reinstalled. Doesn't exist in App Store.
iPhone self reboot during phone call. Some apps reinstalling in background.
Could not download additional sound modules for Soundprism Pro. Still could not download modules after reinstalling app.
Noticed keyboard error when inputting Apple ID password. When pressing keys, instead of character pressed, a question mark appeared. Photo taken with another phone. Could not do a screenshot because iPhone screenshot would not work.
iPhone self reboot during text messaging. 9 apps updating (April 1, 2015, 11:30am)
Audible could not log in properly. Tried reinstalling app.
After manual reboot (cold reboot), screenshot functions works and no noticeable errors with keyboard.
Turned on full access for Fleksy , GIF and Symbols Keyboards. (April 1, 2015, 12:20 pm)
Noticed all 3rd party apps (Kindle, Audible, Dropbox, 1Password, YouTube) credentials need to be re inputted.
iPhone self reboot while testing GIF keyboard. Pasted an animated GIF on a test text message. Was able to paste GIF then phone rebooted. (April 1, 2015, 1:41pm) reboot took approximately 2mins.
GIF could not be pasted into Viber message. Also noticed screenshot function not working. (April 1, 2015, 1:53pm)
After cold reboot, screenshot function works. (April 1, 2015, 1:57pm).
iPhone self reboot while installing Ask Video9 apps. (April 2, 2014, 12:32am). Reboot time approximately 2mins.
Noticed standard keyboard error ("?s" when key is pressed) appeared. Also screenshot function not working.
After warm reboot (Home-Power key), all functions work. Reboot time approximately 1min.
iPhone self reboot while updating RoomScan Pro app and installing Via Crucis app. (April 2, 2015, 7:53am) Reboot time approximately 1min.
Screenshot function not working.
After warm reboot, screenshot function works. Reboot time approximately 2 mins.
iPhone self reboot while installing Way of the Cross app. (April 2, 2015, 8:03am) Reboot time approximately 1min.
Noticed a duplicate of this note appeared with time stamp 3mins apart from this note.
iPhone self reboot while typing update to this note (April 2, 2015, 8:07am) Reboot time approximately 1min.
Noticed that Way of the Cross app fully installed and 5 other apps updated. Looks like reboots happen after app updates or installations.
Noticed screenshot function not working.
iPhone self reboot while installing iMassExplained app. (April 2, 2015, 8:18am) Reboot time approximately 1min.
Noticed screenshot function working.
iPhone self reboot while installing Candy Tech app. (April 2, 2014, 1:00pm) Reboot time approximately 1min.
iPhone self reboot while installing Google Chrome app. (April 2, 2014, 2:42pm) Reboot time approximately 1min.
iPhone self reboot while playing music through a Bluetooth device. (April 2, 2015, 7:30pm) Reboot approximately 1min.
iPhone self reboot while scanning barcode for MyFitnessPal app. (April 3, 2014, 10:40pm) Reboot time approximately 1min.
Noticed Microsoft Word app not activating.
iPhone self reboot while checking App Store app. (April 3, 2015, 1:05am) Reboot time approximately 1min.
iPhone self reboot while using Microsoft Word app and Google Maps. (April 3, 2015, 1:15am) Reboot time approximately 1min.
Noticed "?s" when typing password for Apple ID (April 3, 2015, 4:40pm) Reboot time approximately 2mins.
Noticed that Movie ads not working in Subway Surfers. Then checked screenshot function. Screenshot function not working. March 3, 2015, 7:42pm.
Manual reboot corrected screenshot function. Movie ads still not working for Subway Surfers.
iPhone self reboot while changing lock screen with wallpaper created by Homescreen app. Also Quest Keeper app was installing (April 4, 2015, 1:35am) Reboot time approximately 1min.
Screenshot function not working.
Manual reboot DID NOT correct screenshot function.
2nd manual reboot got screenshot function working. But Passcode entry screen had Home Screen wallpaper instead of Lock Screen wallpaper and screen taps would not register. Passcode entry only working when the screen was tapped and swiped up from the camera icon. When camera was activated from the non working Passcode Entry Screen, a new working screen appeared allowing Passcode entry and after the screen, the camera app was opened.
iPhone self reboot while downloading Bible Gateway app. (April 4, 2015, 1:55am) Reboot time approximately 1min. Screenshot function not working.
Manual reboot DID NOT correct screenshot function.
2nd manual reboot got screenshot function working.
iPhone self reboot while downloading trying to change Home Screen wallpaper. (April 4, 2015, 2:05am) Reboot time approximately 1min. Still could not change either Lock or Home screen wallpaper.
iPhone self reboot sharing/emailing document from iMports app. (April 4, 2015, 10:57am) Reboot time approximately 1min.
iPhone self reboot while installing Candle app. (April 4, 2015, 9:40pm) Reboot time approximately 1min.
iPhone self reboot while adding picture to phone contact. (April 6, 2015, 2:47pm) Reboot time approximately 1min.
iPhone self reboot. (April 6, 2015, 2:49pm) Reboot time approximately 1min.
iPhone self reboot TWICE. (April 6, 2015, 4:11pm) Reboot time approximately 1min each. Fuzel Collage app was updating.
iPhone self reboot while using App Store. (April 6, 2015, 4:15pm) Reboot time approximately 1min.
iPhone self reboot while using App Store. (April 6, 2015, 7:42pm) Reboot time approximately 1min.
iPhone self reboots TWICE successively while installing 7IHS 2015 2Q app. (April 7, 2015, 9:37am) Reboot time approximately 1min per reboot.
iPhone self reboot. (April 7, 2015, 6:25pm) Reboot time approximately 1min.
iPhone self reboot. (April 7, 2015, 7:00pm) Reboot time approximately 1min.
iPhone self Renoir while using Bieber app. (April 7, 2015, 7:37pm) Reboot time approximately 1min.
iPhone self reboot. (April 7, 2015, 9:14pm) Reboot time approximately 1min.
iPhone self reboot. (April 7, 2015, 10:45pm) Reboot time approximately 1min.
iPhone self reboot while copying message from Viber app to iMessage. (April 8, 2015, 12:39pm) Reboot time approximately 1min.
iPhone self reboot while playing music. (April 8, 2015, 2:34pm) Reboot time approximately 1min.
iPhone self reboot while playing music. (April 8, 2015, 2:37pm) Reboot time approximately 1min.
Music shuffles by itself from one album to another.
iPhone self reboot while playing music. (April 8, 2015, 2:57pm) Reboot time approximately 2min.
iPhone self reboot while installing How To Tie A Tie app. (April 10, 2015, 12:12am) Reboot time approximately 2min.
iPhone self reboot while downloading iOS 8.3 update and writing a text message. (April 10, 2015, 7:25am) Reboot time approximately 1min.
I hope the details can help you diagnose the issue.
Thank you for all your help.

Yeah my is the same. Ive had enough of it now...Its been a week of my phone crashing & apps crashing, camera crashing, call dropping out all the time. I've had enough. Apple have done nothing to help it. Ive an upgrade & myself & my partner are buying samsungs.
P.S I've downloaded both ios 8 & ios.8.2 straight from my PC.
I have done all of the above & phone is still unstable & crashes apps all the time. Right now as we speak whats app wont work.
Waited to long now...Apple are doing nothing to help anyone anymore. Company is going down the drain fast.

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OK.........Finally I found the solution for sim problem with update 5.0.1 and the solution for fixing the iphone 3gs keeps rebooting or keeps restarting after 3-2 minutes?
for fixing the sim issues with update 5.0.1 or the rebooting problem do the following:
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