Iphone 5 and iOS 8.1.2 crashing.

I recently Upgrade my iPhone 5 from iOS 8.1.1 to iOS 8.1.2.
Since that time my iPhone has been crashing randomly at times. (The screen suddenly gets black fuzzy lines over it then resets, or it just resets and takes me back to the lock screen or it just turns off) Also the battery indicator does not change unless the phone is turned off and back on so I never know what charge I am on. The iOS 8.1.1 had been working fine with my phone and I did not have any issues which other people (Probably on later phones such as 5S,5C, 6 or 6 Plus.) had been experiencing with earlier version of iOS.8
Fortuantly I have kept my iPad mini on 8.1.1 and Will not do an upgrade as this is still stable and I can at least FaceTime and mail. with out risk of crashing.
Now. I know I was stupid and I had not done a recent back up before updating. This is not too much of an issue as had not done that many changes. However even when I did a restore it still said I was on 8.1.2.

Hello there, BigT1983.
When having issues with unexpected restart of your iOS device, the following Knowledge Base article has some great recommendations:
If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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I had the same experience with a new iPhone 5 that I bought last week. Did not have a chance to measure battery life before the 6.0.2 upgrade installed but I set up my phone exactly like my 4S and immediately started running out of power after short periods. Went to Xmas get together with fully charged 5 and 4S. Heading home the iPhone 5 shut down for low battery and the 4S had 65% power. Both phones had two half phone calls on then and no data usage.
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Hello, Aniket2210.
Thank you for visiting Apple Support Communities.
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For me, switching to a competitor's phone is now a very real possibility.
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Apple isn't here.
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Well, apparently Apple doesn't want us to talk about this -- They locked the previous forum I had created after 217 posts and 16k views?
I'll assume there is some other Apple Forums rule that I don't know about that would cause them to do that instead of trying to stifle the reporting of this problem? It was clearly generating many posts that show a correlation between IOS6.0.2 and battery issues.
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Please keep posting things directly relevant to BATTERY issues with iPhone5 so that this thread can stay on task and bring to light the correlation between 6.0.2 and the battery. Maybe Apple will care about their loyal customers, acknowledge the issue, and let us know how much longer we should wait for 6.1 to fix the issue before it's too late and they start losing their fan base. No information from Apple is only exasperating the problem.

I had the same experience with a new iPhone 5 that I bought last week. Did not have a chance to measure battery life before the 6.0.2 upgrade installed but I set up my phone exactly like my 4S and immediately started running out of power after short periods. Went to Xmas get together with fully charged 5 and 4S. Heading home the iPhone 5 shut down for low battery and the 4S had 65% power. Both phones had two half phone calls on then and no data usage.
That night I fully charged the iPhone 5 and, without lighting it up, put it on my night table. Next morning I picked it up and looked at battery indicator and I had 42% charge with NO activity!
Tried it again next night and wound up with 37% charge. (Slept longer).
Today I called the carrier and reactivated the 4S. Took the 5 to Apple Store and they kindly gave me choice of new replacement phone or refund. I took the refund. Uniquely, the Apple Store said it was Verizon CDMA phones that were coming back.
The are other strings on this with temporary solutions, but from my experience with 7 firmware changes on an HTC 4G phone the problem will continue because the solution will be hardware caused. We are in the days where RTM means Rush to Market - not Release To Manufacturing.
I fear the only solution is to either wait for the next model (I did not notice a really major change in performance over the 4S in LTE heavy Seattle area) - or switch to another manufacturer.
It might be useful for these forums to indicate if you have a GSM or CDMA phone to see which have more problems.
Discouraged....

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Also, it seems to me that the battery is dying quicker. Am I the only person having the issue?
How can I fix the connectivity issue? Or is there any way for me to go back to IOS 6? Some of appes don't work under IOS 7.
Thank you.

Hi yanylove,
If you are having WiFi issues after upgrading to iOS 7, you may find the following article helpful:
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http://support.apple.com/kb/ts1398
Regards,
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http://support.apple.com/kb/ts2802
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If that doesn't work, try restoring the device.
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Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
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Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
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If the display turns on, go to step 4.
If the display remains black, go to next step.
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