Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
Certain frequencies can be affected more than others for a number of reasons, including tuner sensitivity, loss of signal at the cable or splitter, etc. If you want to stop having problems, get the signal issues fixed and perhaps tell us what the signal is if you want more help.
Often something very minor can cause something to change, even if you don't think you've touched anything - temperature changes can cause expansion/contraction, dusting can move a cable enough to give a poor connection, oxidation can create a poor connection, this can happen at each connection, which means there are many sources of potential problems. There can be outside interference, especially if there is a poor connection somewhere. There are a thousand reasons why something can change, even if you think nothing has changed in your home. The Rogers signal can also fluctuate going to your home, so a marginally good signal can become a marginally poor one. Many people have problems with certain channels while being able to get others just fine. Sometimes only one QAM may be affected, sometimes it may be more - depends on how bad the signal is. If you search this forum for threads with signal issues, you'll find hundreds, if not thousands of posts on the topic.
Just as an FYI, I've always been able to get HDMI to work on Rogers with the appropriate settings in the various devices and with the appropriate cable, as discussed in the HDMI FAQ I provided in your other thread. I'm glad you got yours to work with component video.