There can be many different contributing factors to your intermittent playback. The strongest factor that comes to mind is interference with the WiFi signal. The Linkstick runs off of the 2.4Ghz band, so any other devices or signals that also work off of this band may disrupt the signal, causing your video to stop or restart. Blockages and/or distance from your home network router can also contribute to an intermittent signal. Also, make sure that you have the latest PC Share Manager installed on your PC:
Installed PC share manager and connected to TV via linkstick. Was watching a movie, AVI stored in my computer and for 40 min. or saw it worked perfectly. Suddenly, movie started stopping every 2 to 3 mins and reloading. Any ideas on what would cause this?