UPDATE:
Still having volume control issues...press volume down, and it goes up. Not every time, about every 6th time. Twice while watching Blu-ray's last night, and one time today. I did previously move the IR Repeater Sensor off the front of my plasma TV, 1 foot lower than the panel now (as per repeater instructions). But, as I just said...issue is still present. Just moved the Sensor 31 inches away to see if that fixes things. Will update shortly.
As an aside, I a thinking about buying a Harmony Remote to get rid of the issue...as others have in this forum.
UPDATE 2:
IR Sensor 31 inches away...reproduced the volume issue twice. Press volume up, and the volume goes down. It has to be the remote. In addition, hate aiming the remote lower than the Sensor...it's just not natural...and wife hates it!
Just ordered a Harmony Remote 950 (refurbished) on Amazon for $159...let's see it that fixes things...which I believe it will.
Update will follow...