I am trying to follow a couple different guides at making a looping turbulence displacement.

I am trying to follow a couple different guides at making a looping turbulence displacement. I am trying to add the loopout cycles command but I was not sure if i had to use keyframes with it to make it work. I have keyframes for the evolutions at the start and end of my layer. The first key frame I left at 0 and the last key frame I put in 200 rotations. The wave does fine until around 2:45 seconds or so when it stops. Please advise.