My keyboard stopped working twice
My Penryn is about 15 months old. I use it for around 12-16 hours a day. Both times the keyboard quit, the temp (istat nano) was ~61 C. After taking out the battery and letting the thing cool down, the keyboard starting working again.
It hasn't malfunctioned since, but I'm curious why it would stop working from simply getting warm. It's been hotter than that many times before. Is it simply over-use?