Smokin just addressed a similar situation with an Amerique readout:
Posted Jul 11, 4:07 PM Hide Post
I think the display itself got hot. It's and LCD, so keep it from getting direct sun and you'll be fine.
I didn't think it would matter, but I don't get the big bucks like Smokin. So try it in the shade and see what happens. I'd still talk to Cookshack on Monday.