Here's the short of a long story...
New SB6141 modem which replaced a SB6121 that exhibited the same issues I'm having now but was told by Comcast front line phone tech support that it was bad. I was mis-informed.
Comcast says their signal to my modem is ""good".
Had a tech come out...when I watched him open up the vault to the node across the street...the node was submerged in water run off from yard sprinklers. I didn't think that was a good thing but he shrugged it off. After replacing a few connectors at the node he tested the line at the node...checked good. After replacing a few connectors in my house box he tested the drop to the house...checked good. Checked the house line to the modem...checked good.
I'm not an expert by far but it would seem to me that DS bonding channels 6 and 7 are way out of speck. Any thoughts to what may be causing this? What are some things I can say the tech support to get them to fix this problem? I don't know the lingo other than "hey..this isn't working right".
I'm supposed to be getting 50mbps DL.