When I play a movie I use either an USB DVD player or some USB stick. I'll also use some player software.
I would never use both at the same time so your post is confusing and makes no mention of the player software title or if it ever worked.
For example some folk are downloading movies and complain the movie does not play. That complaint is common but is not a sign that there is something wrong with their machine. The movie could be defective and in the case of copyrighted works there are cases we know about where the owners of the movies pollute the torrent shares with broken copies to slow the sharing down. They hope folk get a bad experience from the torrent use and go back to legitimate means of accessing content.
I am using a Toshiba usb dvd player to play my movies of a 4GB usb stick,
The problem I am facing is that after about an hour the movie suddenly stops playing and returns to the start.