Thank you for your suggestion. That is what I thought would solve the problem too, but what I did find that fixed this was how I programed the buttons. I read the article on this site that listed tips and techniques for teaching remotes commands from other remotes.
It stated that holding down buttons longer, gives them a chance to tranfer repeat commands. This worked for me and now I am able to control the volume on my Denon AVR1912 with ease.