Roku remote keeps losing tv power & volume controls

My Roku remote keeps losing the ability to control my LG tv's volume, mute, power. Sometimes it loses it after only a few hours or after 1 day. it's happened 3 or 4 times in the last week. My battery is fine. It's annoying to have to continue to keep setting it up again in the settings menu, and it works, but then it loses it !                 

Model#: 3811X Roku Streaming Stick +

LG tv model 26LV2500UG