My receiver remote is balky on the down button. The top of the button controls the up volume and there is no problem; the button rocks back and forth and the down volume takes a few minutes to work if it works at all. By pushing it over a period of time it eventually warms up and works almost as well as the up. Can I do anything about this or is it better to leave well enough alone? (All other buttons of which I only use a few are fine.)