Those temps are way too warm for a corn. I aim for 80-82 on the warm side and about 8-10 degrees cooler on the other side. But even still, if they were that warm they probably would have gone to the cooler side, which even at 84º, should not have fried them. But if there was a heat spike or something, that could have done it.

Do you have pictures of them you could post? Might help in determining if they did, in fact, get fried or dehydrated.