A Problem With Serging Thread Constantly Breaking

My daughter called me on the phone the other day and happened to be sewing while I was talking. She kept getting frustrated. I said,Why are you so frustrated? She announced that everytime she had to re-thread her serger the threads just keep breaking. I said, "Don't you know that you have to have all the threads threaded and totally seperate from each other, then make sure they are all pulled a few inches behind the pressure foot. "So each one has to start at where it is threaded all the way to the back totally seperate from the other." Well she made sure that was the case and announced, "Why haven't you ever told me that". We as a family have been sewing for years and I just assumed she knew, because she had watched me so many times. Glad I was able to help.