IPhone 3G wont stay connected/powered?

Hello,
I've an iPhone 3G (yes its old want an iphone 4 but can't afford one) I update it to the latest iOS in iTunes last night i have only just updated to iOS 4.2.1 i was running 3.x something however i updated it last night.
However since i have updated it my iPhone will no longer stay "connected/powered" when plugging into the wall charger it's fine on USB but don't wanna charge via USB in computer everytime.
I plug it into the wall charger it has the battery with the battery icon what appears when charging then it vibrate and disconnects and then vibrates twice and starts charging then it vibrate and disconnects ect.. over and over again.
What could this be? was fine till i updated to iOS 4.2.1 last night in iTunes.
What i've tried
- Restarting (off for 10mins then turning iphone back on)
- Tried other wall sockets around the house.
Device;
- iPhone 3G
- iOS 4.2.1
* The charger is the adapter with usb cable one that come with the iPhone when i brought it.
Edit;
found https://discussions.apple.com/message/12724318#12724318 also.

Ok, ive restored now...and the phone wouldnt connect to 3G, but this was before i set up as new iphone. So im doing that now in the hope that it will work after everything has been sorted...but im not holding much hope for it to work.
How annoying, i honestly wouldnt care half as much if there was an explination for it all...a reason. but there isnt, it just happened.
iv been intouch with my network provider to see if theres anything that can suggest....such as sending my phone away to apple. because im totally puzzled as to what is wrong and why its happening.
anyways, thank you VERY much for your help and your time.
Anita

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