[sudo-access] front door computer randomly turns itself off

this has happened in the past and a couple of times this week, i think, that the computer that handles the front door magnetic stripe reader shuts itself off for some reason. it's a beaglebone black and there is no reason it should shut off. there are no logs as to why because we generally run it in read-only mode on the main disk, and logs are kept on a RAM disk. here's someone else talking about the same issue: http://falconchristmas.com/forum/index.php?topic=5547.0 when it's off, it has power but there are no lights on. pressing the power button turns it on. wtf? i could make a watchdog circuit that power-cycles it if this happens, but i don't think that's really the right solution. does someone want to take this on and figure out wtf is going on? probably using a USB stick for system logs would be a good start, and maybe some increased level of logging. -jake