I noticed that if I raise the laptop off the surface of the table a bit (and hence cool it more aggressively), the problem I have becomes non existent or very rare: a temporary freeze of input (cannot click on programs and the 'busy' cursor appears) which also manifests itself with a freeze of videos and games. It goes back to normal after the 4-5 seconds it occurs. There is high disk activity at the time (or at least the disk led is on).
I had ruled out sleeping of disk since I had disabled power management on it and it is 1 disk that is the system disk anyway. Of course, I couldn't know if there is a bug with the hardware or firmware.
And now that aggressive cooling appears to solve it or alleviate it it points to overheating anyway.
It can not be by chance since I notice the more stable behavior for days now.
Is there a way for overheating to make the disk 'spin down' for a while? Or what else could it be. I'd find it hard to be merely the CPU heating since those don't usually freeze systems, unless I guess it brings up a switch and conflicts with something. Something switching on the motherboard perhaps. Any ideas?