IOS5 signal problem on iPhone 4

Updated my iphone 4 to iOS5 yesterday and today I'm having lots of problems with low signal.
The signal seems to fluctuate between one bar, then to 'searching', before saying 'no signal' and then it shoots up to full signal temporarily before going through the whole cycle again.
Phone calls keep getting cut off because of this. Restarting the phone seems to fix the problem but only for a while.
Never had any signal problems before with this phone, even with the whole antenna thing.
Anyone else having similar problems? Found some other threads online but most seem to be for jailbroken phones... mine isn't.
Cheers, any help would be great!

Tried restoring to factory settings yesterday and that seems to have cleared it up. Looked at my phone once last night to see 'no signal' but I restarted it and has been fine since. Have made phone calls and used the internet today and the signal hasn't dropped (which is what was happening before). Its a pain in the arse but at least it's working for the time being.
When I couldn't get signal someone rang O2 and Apple for me. Both said it was the first they had heard about this and to try re-installing the software. I'd already done the restore to factory settings by this point though so not sure if that would help.

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