I have Comcast Cable and Internet. Internet is painfully slow and Cable has been a problem for about 6 months. Cable started losing some channels from about 10am til 8pm about 6 months ago. Screen is either a mass of pixels or black screen with notification; will be available momentarily. That notification can display all day. It has continued to lose more channels and now I have NO reception during these hours. I have called Comcast many, many, many times. Service has been to my house over and over. Still No Joy!
Here's some things to check:
If there are signal splitters on your cable for TV, computer, more than one tv, the signal is getting divided ...every splitter will weaken the signal.
Check for unneeded splitters, also there are splitters that have a wider frequency capability.
Consider upgrading to 2hgz splitters if needed.
Also I think that the more homes that are on the cable tend to make the signal weaker...I don't comcast would fess up to this, but I'm pretty sure it's true.
Make sure all your cable connections are snug and you may want to double check for corrosion etc. on each connection.
I resorted to a signal amplifier on my home. We've got comcast for cable tv and internet, with multiple tv's and multiple computers.
The amplifier (motorola) boosted the signal for everything and we've got way less dropped, frozen pix, black screens and the internet is back up to speed.
Comcast even came out and put a signal strength meter on the in-line to the house and stated it's within their limits... Glad I put the amp on the line..
Give it a try.
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