On my prior coach I had that happen. Turns out the outer dome is held down by a bunch of screws, and not all are always torqued the same. That causes a stress which doesn't show until finally it just gets to be too much. So a cracked outer dome is not unusual.
I removed the dome (getting all those screws out wasn't easy), replaced it, fastened it down properly and sealed with dicor and Eternabond. It held as long as we owned the coach.
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