To give a bit more information from what I can found out, rather than speculating about something "bad happening" which is very unprofessional of a TM.
From what I understand it's a culmination of it basically needing a full scheduled maintenance to get things back on track (no pun intended) . The ride hasn't had one since it opened 2 and half years ago, has run more times than some entire other parks coasters combined, combined with the fact it's crazy fast obv. I don't think anyone has ever been in danger and the people who are quick to rave about it are the same to run their mouth off about Intamin the moment it has downtime.
Even goats need a vacation from time to time