for the past week or so i have had continuing problems getting my hr21-700 to respond to the remote control. it's not the batteries, i put brand new ones in and am still having the problem. the box either only accepts half the commands i put in, or none at all. from reading other threads i tried the RBR and it works, but for diminishing amounts of time. at this point i have to RBR 2or 3 times a day. is there any solution for this? would a RF remote work better?