Iphone shutsdown from snapchat?

So, i was using the snapchat app perfectly from a long time, without any problems. But from a couple of days there were an update for the app, so i updated it. Then when i tried to open snapchat, the screen of my iphone gets dark and there's lines also. And then the iphone shuts down completely and restart by itself. I was never able to open the app again. I tried deleting it and install it again but no use.
I have iphone 5 jailbroken, ios 7
Can you please help me?

I also had same problem with dropbox. I also did same as u, so i unjailbroke and all apps are fixed now. So i recommend you to. Unjail your device

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