Did you have any errors? My best guess is that you’re suffering from a lost USB connection because of electronic interference. Have a look around here in the forum, there are many threads about this, I summarized my experience with this issue here.
Regarding your last question, you can if you have a three sided touch plate or the homing switches. With the touch plate you can just rezero and remove the already carved stuff. With the homing switches someone else needs to pitch in, I don’t use that workflow.
Depending on how much is missing in your carve (I can’t interpret the screens, not using Easel), maybe you can carve the rest in a kind of close-enough way (if just some rectangles are missing).
If I were you, I would invest more time in investigating the stopping issue first, it will save you a lot of time down the road.