Went out to check the footage on my K2 and found that it's dead and won't power on (no wifi network, no LED lights, and no dashcam footage). I pulled the SD card, and the most recent footage is from SIX MONTHS AGO. I guess I'm extra glad I didn't get in a wreck during that time, because this $400 paperweight would have just been laughing at me.
First I checked if the button would turn the unit on, since the ignition line to the K2's power supply (yellow wire) did not. Nothing. Then I tried unplugging the unit and letting it sit for a few minutes and reconnecting it. Nothing. Next I pressed and held the reset button. No life. I checked the wiring for shorts or damage and didn't find any. So I dug out a multimeter to check the voltages and found this:
It looks like the power supply melted a bit there. And there's 0V and 0.2V on the lines to the DVR itself.