The plates on my GHD's dont sit properly?

I've got a pair of the normal size GHD's, i've had them for a couple of years now, recently I have noticed that the plates aren't sitting properly, the two plates have popped slightly out on the same side. I've tried pushing them back in but they dont stay, and now when I use them they pull out my hair.
Is there anything/anywhere I can do to sort this, or am i best to buy new ones?