On my iphone my some apps crash! Read Details?

When i open Cydia or Safari it closes! It does that to my sis to and her phone isn't jailbroke! I already tried to reset. I go on a game and the game freezes! What do i do?! We have an iphone 4

Added (1). If its because its jailboke my sis iphone isn't jailbroke and it does that

Added (2). Oh and i already tried double clicking the home button and deleting the background apps and still does the same thing.

You may have to do a restore of the iphone if you have already tried the hard reset method. And it may be because the phone is jailbroken.
When i owned the iphone 3gs years ago i jailbroke it and although it opens the phone up to new things! The phone started running like a dog after the jailbreak, So in the end i decided to restore back to it's normal state and i never had another problem with it.
And although i have owned every iphone since i never have jailbroken since after the first experience.

The same thing has been happening to my 4G iPod Touch. It started happening with the last iOS update. Guess we wait until apple comes out with a fix. At least they fixed the Wi-Fi problem.

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