I've scored several movies in Logic on this laptop. usually on Logic 9. I recently "upgraded" to X. Early 2011 15.5" MacBook Pro, logic board replaced a couple times, 2 GHz Intel Core i7, 16GB RAM, Sierra MacOS 10.12.6, Logic X. This is the first time this has happened. The movie I am working to will freeze randomly. I'll be scoring in the arrange window then all of a sudden the movie will be stuck on a particular frame and no matter where I put the playhead the same frame is frozen. Meanwhile I could work in the arrange window with my software instruments and such if I wanted to, the movie freeze problem doesn't affect that. I have to Close the program, then reopen and it is Ok for a time till it happens again. I even have wifi off and all other programs quit. If anyone can share any insight into this matter I would appreciate it. Thank you.