Default phone, message and calender closes after 5 seconds

Hi, I don't know if anyone has come across this before, I can't find any relevant threads.

When I open the phone, message or calender app, they automatically close after 5 to 10 seconds with no message. I havereset the phone to as it was when it left the factory for them to work again.... Then after a few weeks it happens again. I have not installed any new apps so don't know how to solve.

Vodafone say send the phone for repair but they will reset it first which will cure the problem. It must be software related!

Thanks

Chris