you may need to replace your SD card
if the card becomes corrupted and the head unit can't find the information it needs, it will reset like that
it can also occur if you load compressed files to the card (.zip)
I have seen one Mini Maxx and one XRT Pro head unit that had a problem where they would reset when you hit the install download button. That was what equated to an operating system error, and they had to be reflashed by the manufacturer.
But with yours resetting at the point where the unit would begin assembling files, I'm leaning towards the fact that it can't properly access the files to begin building with.
Hopefully it's just an SD car issue