Typically, as I understand, this should work opposite from what you're indicating.
Instead of walking closer to the box try clicking from farther away from the box or gradually angling the remote away from the box until you get a response.
Essentially test the distances as perhaps the signal is strong enough that it's overpowering the IR sensor in the box.
Just a thought but I'm guessing that you're further away in the living room versus the bedroom.
If it works by pointing it away try something simple like putting a small piece of scotch tape over the front of the remote to decrease the signal.
Another possibility is this thread:http://forums.roku.com/viewtopic.php?f=28&t=25550