Q: Apple TV

I am currently experiencing a difference in my Apple Tv - 3rd Generation - Rev A. I have previously changed the name on my apple Tv and thats where the problems started, since then I have changed the name back and have restored the whole system on the apple tv. None of this had made a difference. When ever I try to watch a movie streaming from my laptop (which it used to work until now) it shows the loading symbol for approx 5 minutes then completely quits out of the movie and the laptop then won't connect. I have also tried to do a screen share but the same thing happens. I have tried to also connect the laptop via "home Sharing" and the movies still don't seem to load. If any one has an answer I would GREATLY appreciate it!!!