Sprint Epic 4g contacts issue

[JP3]

I searched but saw nothing....

OK ..I have certain contacts not all that when I click on name it starts to switch as it should and then a warning box appears:

" SORRY
The process android.process.acore has stopped unexpectedly.Please try again.
The a box that says"force close" in it."
and it happens consistantly so I cant get into that contact...

of course it is always the important contacts that this happens to.

any help is appreciated and I am not very knowledgable about the inner workings of phone it is stock..
THANX