My app reboots iPhone on 4.1 iOS

I've upgraded my iOS on iPhone 3G to 4.1 and now I run my app on the device. Firstly, I cou开发者_StackOverflowldn't install it becouse Xcode was saying I don't have certification etc. (I have jailbroken iPhone). Finally, I succeeded and installed it.

But know something strange happens.... After I had installed my app on the device I run it. Then, "cocos2d" image appears on the screen and just a second later device switch off! It simply reboots.

What's more - when the device launchs again and I run my app - it works!

I have no idea what's going on. This app works fine on 3.1.3 iOS (even with the same Xcode - 3.2.5)

What should I do? Do you think the problem is caused by Xcode or iPhone itself? Maybe reinstalling Xcode may help?

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It could be one of two problems.

It could be a problem with your device. Maybe something got sort of wonky with your jailbreak.

Secondly, it could be a problem with your app. Maybe it's crashing. Have you checked your crash logs?