sandisk and nexus 10


i have had the Sandisk connect wireless stick for a while and have been using it on my Nexus 10, it had been working fine using the Sandisk Connect drive, but just recently whilst playing video , it will start the video then after a while it stops and a message appears " this video cannot be played". it does not do this when i play video on my Samsung phone , and it hasn’t always done it on the Nexus, and help please!!