I've got like 3 or 4 cards that all of the sudden are showing 250GH/100% hardware errors?

I have them off now and will let them cool completely down before turning them back on.. But reading on here that some people solved this with firmware reflash's.

Do these cards get in situations where they need to be re-flashed? Or can a reboot always get them "back"

I am currently running the 14e flash that has the 1.1v limit.