How about this?Ok, more info. It's NOT eco mode as the problem came back. After talking to some more folks over at DashCamTalk, and a mechanic friend who looked up the service manuals, I think we know what's going on.
The car has a ton of electrical components that stay running when you stop the car: the digital dash, the touchscreen, carplay, the modem, the fob proximity sensor, and more. There's so much that it drops the voltage below the 12V cutoff on the dash cam. This behavior is within Nissan's spec, but doesn't play nice with the camera. Not sure how Nissan's rebranded camera does it, but that basically doesn't matter.
The only real solution is a battery for the camera. BlackVue sells one for $360 which is a downright absurd price for a 6000mAh battery. Even at $100, that's probably 80% markup for them. It's a price for suckers is what it is. To solve this problem, he's going to build be a board with a buck boost converter and some LiFe batteries for $40. No risk of a lithium-ion fire, so we're just going to wire it up and shove it under dash and call it a day.
So yeah, this has been a "fun" adventure. I'll update once this thing is installed.