PBP locking up multiple times per day - keyboard and mouse unresponsive

[tophneal]

i've seen this issue in chromium browser and os. usually the best way to get the PBP useable again is to let it sit where it can cool down, or introduce some airflow to the bottom of the shell. i can pretty consistently recreate this same kind of issue in almost any OS, when my PBP is in my lap, or sat on a couch cushion.