E51 Error Code and why

I have an intermittent error that keeps on coming up on my E51.This happens when I press the Menu Key.The phone seems to lock up and at the top a "C" appears every time I try to go into the menu.
What it looks like is a book then a "C" followed by my network which is O2-UK.
All other features work and by turning the phone off and on clears this.
Any help as this phone was a Christmas Present so not old.

This is an update to the problem.
Now when I sometimes press the Menu Key the Phone now locks up completely.
This means I have no access to any funtions.

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    Apple Diagnostics:
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