Earlier today, all the physical buttons on my n810 stopped working. I was using wifi whilst charging the tablet at the time so I did wonder if temperature played a part but the unit didn't feel that hot... Has anyone else had this type of problem?

Thanks,
Chris

I doubt it was heat. I frequently leave my N810 on top of a lamp in my bedroom, and the thing is very hot to the touch, but it still works perfectly. Most likely you ran into a software bug.