IPhone 3G keeps turning itself off and on by itself-Any advice how to stop?

Earlier today, I noticed that my iPhone 3G began cycling back and forth between the main menu and the screen that has the red slider button that you can push to turn the phone off. It is cycling back and forth on its own without any human touch whatsoever. It is going through the cycle every 30-45 seconds. If I turn the phone off using this screen, the phone turns itself back on. If I choose to ignore it, after about 30 or 45 seconds or so, it will go back to the main menu. I did a full restore and it is still doing the same thing. I have the settings for "Auto Lock" set to "Never" so I don't think it's a problem with that setting. Does anyone have any other suggestions for how I might address this problem?? THANKS for any help and/or suggestions on how to cure my problem without physically going to see an Apple Genius.
PDUB OKC

I have the exact same problem, the cycle is around 15 seconds.
The phone goes from standby to the 'slide to unlock' screen and then goes back to standby all on its own, and it does this continuously until it bleeds the battery dry - it's killing me as it keeps catching my eye when the phone's on my desk.
The following scenarios stop this happening.
- I switch the phone to silent (I'm using this as a stop gap solution).
- I'm playing music through the phone's speakers.
- I'm playing music through headphones.
- It's charging.
- It's connected to my laptop.
I've tried all the usual stuff, rebooting, restoring, airport mode, no wifi, switching off all notifications, removing all 3rd party apps, turning of all push/email related programs etc...
I'm pretty stumped to think what's causing this, when it started happening I'd done nothing new/different to the phone (no new apps installed, I'd not synced it, knowingly dropped it, had a issue plugging in the charger or headphones).
I'm at the point where I think I'm going to need to go to the O2 shop (one of my least favourite things to do) and experience customer service...there must be some clever dick out there that knows how to resolve this....?????
TIS (hopefully)
P.s. I've posted this in another thread on the same subject, just trying to increase my chances of it being seen.

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IPhone 3G keeps turning itself off and on by itself-Any advice how to stop?

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