My Book Live disconnecting from Samsung Blu ray player during playback

My wireless signal is Good, I’m getting 4 bars out of 5. Unfortunately my router in the basement and I’m on the second floor so it’s not really possible to run a cable at the moment up to my room to the blu ray player to see if that’s the problem (and there isn’t a tv down there to hook the blu ray player to).  Nothing else connected to the wirelss intermittently disconnects like this so I don’t think it’s the signal strenght? I’ve been able to watch Netflix from the blu ray player without issue for example. It’s only when I try to browse through files on my MBL or watch a video that it will suddently disconnect.