AMC Theatres review: late movie start

Last night I went to see Fantastic Beasts at one of your imax theaters in Lawton, ok. The screen remained blank for 40 minutes after the movie was supposed to start. When we went to go tell someone, the first thing the employee said was "oh [censored]" and promised to skip the previews. I am concerned because none of the employees were surprised and my guess is that its a common occurrence.