IPhone 5 keeps crashing on the start up screen?

I have an iPhone 5 running iOS 8 non-jail broken the model is MD654LL/A i run the latest version of spotify on my phone it works on my laptop but not in my phone it keep crashing right when I get on the spotify app, it stays on the startup screen with the logo and the spotify name and stays on that for about 10 seconds then goes back to the file where my spotify is located then does the same thing over i have re download it a lot of times also have rebooted it and clear my safari browser a bunch of times then deleted the app then troubleshoot it please help me I pay for this monthly subscription I don't wanna cancel it help!

IOS 8 should not be available on iPhone 5. You are using an out-dated version of iPhone and need to upgrade.

On your subscription, get the new phone and transfer to a new phone.

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