My iPad 3 three suddenly this morning got very hot all over.
It had been on charge for 2 hours beforehand.
I switched it off, left it for 40 minutes.
It cooled down completely.
I now have it on, so far for 30 minutes and its perfectly normal,
not even warm.
Should I worry?

Panic over.
I'm in a hot - 30c - climate, Spain.
The iPad is in a black compo case.
In spite of that the grey back surface gets really hot.
Odd that.