Iphone 4 turning itself off and then on again?

As soon as the phone turns on again, it get's to the passcode bit and before i can enter it the phone switches off again to the loading sign and then turns itself straight back on again and it's been repeating this for around 2 hours, now though before it is turning off, all these different colours show up on the screen and they're fuzzy then it will switch off. i'm on prepaid so is it worth going into apple about it?

Did you already try to set it up as new device without using the backup afterwards?
How to back up your data and set up as a new device

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