Mine shut down suddenly yesterday.
A brief examination shown that the vents were clogged with dust. Vacuum cleaner time again.
Shouldn't there be some kind of warning when the thing reaches a critical temperature?
You'd think that - my graphics card for the PC (notorious things for overheating, 'cause usually dust and crud will eventually always build up in the little fan that is required to cool it) has a app that does measure the temperature of the device...but if it overheats too much it just causes the whole PC to crash and gives you no inkling that that was the cause (other than bitter experience and on occasion the need to spend oodles of money on a new bit of expensive kit -- Hey, maybe that's why they don't have a warning?!?)