Intermittent picture pixelation on all channels

Thanks to everyone who spend time to reply and trying to help.Here my own “internal” investigation and conclusion.My initial guess about signal strength fluctuation seems to be the root cause of the aforementioned problem.

I have Cisco 8742HDC cable box.Today I started to document signal and S/N levels (Page 8) in diagnostic menu.Here is my observation:TV works normally stable and without any intermittent signal issue for all channels for more than two hours (from 10am to 12:30pm) with following signal Level and S/N ratio.

All would agree that we can put to rest cables and loose connectors issues at this point.

The next screen shot was taken when problem occured

That what was on the screen at the same time.

 After monitoring for more than three hours I can attest no problem,no pixelation or any other issues when signal remains at 2dBmV and S/N =38/39dB.

Hi Genadios,

I am sorry to learn of your issue.  I would like to schedule a follow up to have the technician reassess the troubles.  Please reach out to us on Twitter at CoxHelp, visit us on Facebook, or by email at cox.help@cox.com.  Please include your full name, complete street address and details of your concern in your message.

Cox Forum Support Moderator
 

I agree it sounds like a signal issue.  Did the tech climb the pole and check your signal at the tap?  If you have Cox Complete Care, I'd suggest you continue to contact Cox and schedule tech visits until your issue is resolved.  Eventually, a tech will detect a signal issue, if he checks the mainline signal.  If you don't have CCC, I wouldn't recommend that strategy because it could get expensive, unless you want to subscribe to the service for three months to get your signal issue resolved.   I believe there is a three-month minimum.  I know you shouldn't have to pay to get Cox to fix their issue.  You might be able to negotiate that and get the $10 monthly charge for CCC removed if it's determined there was a mainline signal issue that went undiagnosed by the first tech.

Do you have cable internet with Cox? If so, any problems with that? You could look at your modem's signal levels to see if those are fluctuating and when. You could also use pingplotter to measure the disruption over time. Last, you could use the box's diagnostic to see the signal strength. What model box do you have?

Other then that your would need a signal meter to measure the signal going into the box, which is expensive and probably not practical. I can give further instructions based on what you want to try.