Reliability of Bookings

[nucdrf]

We have booked three cruises on Celestyal in the past four years.  Two of them were cancelled, one two weeks before sailing.  On my third booking, a 14 night cruise, the itinerary has now been modified so that the trip visits the two of the ports each week, which is a real change from the interesting Northern Greece itinerary we originally booked.  So we've had to cancel that cruise.  It seems to us that Celestyal is a remarkably unreliable cruise line.  Has anyone else had this kind of experience with Celestyal?