I've gotta say that as a beginner in e-mini trading I'm always looking for reasons to trade this or that index future. This many outages for YM in such a short period of time is unacceptable. I haven't seen this happen as frequently with the CME/Globex futures. I'll be looking alot harder at ES/NQ/ER2 in the future.
One of the things I like about trading YM and ES is that if one exchange goes down you can offset your position quite easily on the other.