... and it just happened again, this time when scenography in @YungBlood's beta app hanged the RokuTV #5200 @ 7.2.4143 - after reboot the NIC again showed null MAC.
On a side note, i am surprised how reliably Roku crashes with this particular <app id="106006_01f4" type="appl" version="2.0.200">G4R-KaBoom!!</app>! The name is apt, coincidentally. All one has to do is start it and press "Back" button - and KaBoom!, the player is hanging in need of reboot. How come RSG can kill the whole player, 7.2 is supposed to work reliable - no?
Although I have quite a collection of Roku's, I don't have any Roku TV's yet.
I tested what you said, starting the app and pressing back. I tried this on a 3600X (Roku Stick), 4200X (Roku 3), 4400X (Roku 4), and none of them exhibited this behavior.