Roku arrow buttons don’t work right

Up till yesterday it worked right. Then not.  I put in fresh batteries.  No help.  When I start it and I see the first screen I push the right arrow but nothing happens.  I push the up arrow, the screen scrolls up from Home to Settings.  But if I push the down arrow the screen starts to scroll down endlessly and I can’t stop it. It goes from Home to Search to What to Watch, and endlessly down the whole list, back to Home and it just keeps going.

if I can get it to hold still and I can get the right arrow to move to the icons of the channels to choose from and I can get an up or down or right or left arrow to get me to the channel I want, (for example YouTube) about half the time I get the video I want and half the time the video I choose just starts behaving just like the Home Screen does like I said above.  Scrolling endlessly up or down with no way for me to make it stop and just let me watch what I chose.

it obviously isn’t working right,  what are my options?