Logged out of the app store and can't log back in!

Hi all,
Earlier this evening I logged out of my app store account on my iPhone and now I can't log back in. It says "Could Not Sign In" - "An unknown error has occurred".
I tried logging in with my other two Apple accounts and it still says the same thing! I've made sure the password was correct and I have not enabled any restrictions.
Your help will be greatly appreciated.
Thanks

Thanks for your reply, I did a hard reset instead (holding down the on/off button + home button until the Apple icon appeared). I checked the iTunes and app store in settings and my account was signed back in.
So I proceeded to sign out of the app store again and sign in with a different account. Same problem occurred.
So I did a normal restart and tried to sign in again, the problem persists.
I have just done a hard reset and now my account has been signed out with no way of signing back in.
Help... please...
*Note that everytime I did a restart I closed the app in the 'background' to ensure it starts fresh

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