My new TIVO Edge remote is programmed to control the power and input on my Sony TV, but there are problems with the the mute and volume buttons. The mute button does not mute the volume when I press it. But I can mute when I press the mute and volume buttons together. In addition, the volume up/down does not act as a slider. I have to repeatedly press it. Every time I call support I get different suggestions that do not fix the problem. Do I have a defective remote?