IPhone was cleaning Pandora and now it doesn't work?

Yesterday I was trying to use Pandora on my iPhone but it was faded and said "cleaning" underneath, so I couldn't open the app.

I've never seen this before but decided to just let it do it's thing since there was nothing I could do then.

Now this morning I opened Pandora because it was done "cleaning", and it plays for 5 seconds and then shuts down. I tried again, same thing. It happens over and over again. This has never happened before.

Has anyone else experienced this? Was this a virus, or why would the iPhone cause this to happen?

Get iPhone 6 it would be the best choice and also install Leo Privacy Guard It will help you to protect your personal images and videos and it will also help you to lock various applications