I did something today that locked up the 17" display and required a full reboot. This is on the latest and greatest v4.2 (1.19.42).
When I was leaving the house today I had gone back and forth between the camera display and the homelink menu. I must have done something wierd. I went to full screen nav and began guided navigation to my destination.
20 minutes later, my wife wanted the rear view camera on. I tapped the camera icon, and the video appeared in the top half of the display, but NOT framed by the UI bezel. Map was in the bottom half of the screen.
I then tapped the button to swap top and bottom, but the video remained on the top half, above the UI bezel.
I tried to fiddle a little more to fix it, then noticed that my map was frozen. Wouldn't pan, zoom, or update. Rebooting solved the issue (I rebooted just the main display, while driving).
I want to reiterate that other than this 1.19.42 has been pretty stable. Only one minor issue which has persisted since 4.1 for me. This one, while a bigger issue, seemed to require me to do something unusual to trigger it.
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By the way, i don't notice any regen differences in 1.19.42. When I get down to 6MPH, the regen tapers off, just as it always has.