Actually, we had some similar issues a couple months ago. As more digital channels are added, the stronger the signal needs to be. If you have more than 4 rooms with cable TV, you could possibly have too many splitters and weak signals. That was our situation. We had boosters put on and the quality is much better. The tech told me that it is only going to get worse as the signal strength requirements increase, impacting those with existing weak signals even more. So if you notice that HD or Non-HD channels don't come on or don't have audio or if some upper channels no longer work, you may need a booster or two. Example: HBO 300 HD worked for us but HBO 301 did not - the booster fixed weak signal frequencies.