Mov.stop error with MovieStim

i.e. try one of the other movie stim backends (2 or 3) to see if this sound issue is improved.

On unrelated performance matters, it might be worth instantiating your three movie stimuli in advance (it can take a while to create each one, leading to delays between each one). Your code to play them seems to be identical, so this could be rolled into a function, which would make your code more concise but more importantly, more maintainable.

e.g.

movies = []
for movie_filename in ['Experiment.mp4', 'Resting_somesound.mp4', 'VPCstim3.m4v']:
    movies.append(MovieStim3(win, movie_filename, size=[1920,1080], flipVert=False))

for movie in movies:
    your_movie_playing_function(movie)