When unlocking with touch ID phone goes black with apple icon then locks again?

when I go to unlock my screen with the "touch ID" the home screen opens for a flash then goes to a black screen and the "apple" logo appears for 10-20 seconds then locks again.  If I try to unlock with touch ID again it'l work usually.  When using my pass code with the keypad no issue.  Phone is brand new 7.0.4 software was already installed on the phone. 

Thanks for the input.
Unfortunately that is not my case: I close all open apps several times a day and just had four open windows in Safari.
I closed all of them, just to make sure and did a reboot.
That helped for around 5 times, then the phone does the same thing again.
It actually doesn't reboot but just displays the black apple logo on a white screen for about 10 seconds and after that gives me the home screen.
So it is definitely not a reboot, I think.
Until now I assume it is an error, it would just be nice to know if it is a hardware or software error.....

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