Blurred labels in the iPad app

Hello,

We have been developing an iPad app and we are seeing one strange issue.

Once we deploy app on device , in some of the iPads we see that fonts of all the labels are coming as blurred (fonts are visible but are faded/blurred).

In some iPads, we can see the issue but couldn't see the issue on all the iPads.

It is not os specific (seen on both ios5 and ios6) . Issue doesn't go even after killing app or reinstalling it.

If device show issue , it will always be there and if device doesn't show issue, it won't show it ever.

Any input on when this can happen or anyone has seen it before?