Is there a shortcut to getting a check on the line running to my house?
I'm a reasonably sophisticated user (I would by no means claim to be an expert however).
A couple of weeks ago, the signal-to-noise ratio for my cablecard fell off a cliff so that all I get is pixelated garbage on my TV.
Somewhere around the same time, my modem can no longer get a lock on the upstream and its download speed tops out at 25 (I'm paying for 175 and used to get that reasonably routinely via Xfinity's speed test page (and others)).
(So the quality problems span across internet and CATV.)
I've made no changes to my network topology. Just to be sure I've tightened the various cables (Comcast supplied and installed) in my house (the splitters are Comcast-supplied and installed as well; there are only two two-ways; there are no unterminated taps).
I have let this sit for a couple of weeks because the last several times this has happened it has been a multi-week experience and like the rest of us I have a household of kids in online Zoom school. Before I disrupt our life, is there some simple way to ask here or via another support channel for a check on the line?