Iwas using my 64 gig 3G IPad on the patio and got warning triangle with "IPad needs to cool down before you can use it". It was not really that hot outside but IPad felt really hot. Itook it inside and let it cool down. When it felt cool to the touch I took it outside again and started use it again. After few minutes I got the same error message. It got me concerned that maybe battery is malfunctioning but it works fine inside. Anybody experienced something similar?