Constant Loss of Service

Good point. OP said "dead" as in no lights? If so, check the power cord and make sure it is plugged directly into the electrical socket and not a surge protector/power strip.

I was thinking "radio silence" dead.  Renters return these things for a reason and I've always questioned a standardized bench-check before reissue.

Or if you can get the problem resolved, DO IT! I have been using Cox at my home since 1993, and the one time I had an issue, they resolved it, and I have been running great since. My modem has been online 

And that's because I had a power outage 40 days ago. Get the problems fixed, and it's great. Or you can sit by and kvetch. 

I think most of these types of long standing problems require a technician and Tier 1 is now pushed to avoid technicians, scaring customers with 75$ charge even when the problem might be outside. I wish you could get CCC for only 1 month to cover issues like that.

I didn't know you rented the Panoramic router and subscribed to Cox Complete Care.

Even at 3 months, it's 30$, and if the tech spends an hour running a new cable through the home, it's WELL worth it. Even if all they do is replace a barrel connector or 2, (though it's easy enough for most people to do), if it fixes the problems, it's still 30$ well spent. Of course during the 3 months call in for software support, get a tech to scan your computers, make sure all updates, new drivers, etc etc is all taken care of. You can get a lot for that 30$

? I don't rent a pano modem, and I don't subscribe to Cox Complete Care. 

So you registered just to bad mouth Cox? What ever floats your boat. I had Cox for 10+ years and only had problems when I moved to a area with bad wiring. I think a electrical transformer was causing a interference problem with a amp which was causing T3 errors with my modem.