S33 Blue LEDs have gone very dim over time.

If the LED lights on the modem appear dim, it's completely normal—unless you're experiencing connectivity issues.

Thanks for the reply, and yes I was asking in relation to random connection issues.  As long as I’ve owned the modem, and had it connected to my Cox account, it’s had random drops and disconnects of various types.  For a while, it was stable and then yesterday and today it had the issues again.  Cox has been out numerous times and never found major issues.  I also didn’t have a second modem to try, so I bought the  CM3000 today from Netgear to have a different brand / model / hardware to compare it to as I had no way of separating modem issues from provider issues.  I still have a Warranty on my S33 through Arris, until November of 2026.  I wanted to have a second modem though in case I'd have to send it  in, and end up without internet.

I have also learned that Blue LEDs can dim / fail quicker than other colors due to  how they are made. Blue / white.  The Blue LEDs of the modem were very bright initially and dimmed over time, and was the main cause of initial  concern.  So, bottom line, if it had just been the dimmed LEDs I wouldn’t have even come here to ask.  It was because of the combination of random connection issues and then the latter dimming of the Blue LEDs,.

I recommend visiting www.arris.com/consumersupport to get in touch with Arris technical support.

Hey all,  Just wanted to follow up and mention that I did call Arris support, and I can’t just send the modem in to have it tested.  They need to troubleshoot it over the phone.  Since the modem is no longer the active modem on my Cox account, I told the rep I’ll call back if I decided to activate the S33 again as I have until Sept of 2026 before the warranty runs out.  In addition, I started having issues with the Netgear CM3000 losing connection too.  Part of that was due to Cox having network issues and they resolved those, as I got the reports in the app under status.  A tech came out to my apartment yesterday and replaced my two connectors that were out of date, 1 in the closet where the line comes in, and the one in the wall plate.  He also checked outside.  I have a good strong connection it’s a direct run with no splitters between the tap and my apartment.  With this said, it makes the signal high, and it was slightly out of spec, so the tech put an attenuator on the back of the Netgear modem to help bring the signals back into range.  So far things feel good.

With that said, in addition to the Blue LED almost being burned out completely in my S33, I noticed the coaxial jack was also getting hot on the modem just from being powered up. It wasn’t hot enough. to burn me, but it was hotter than it should have been period.

So, I’m going to just keep the S33 as a back up since things appear to be stable now.

Thanks again for the help, and feedback.

Thank you for letting us know.

Since the coaxial jack feels hot to the touch, I recommend contacting your ISP to have the coaxial cable inspected or replaced.

If the modem itself is too hot to touch, or if you notice any burning or plastic smell, please unplug it from the power outlet immediately and visit www.arris.com/consumersupport for further assistance.

The Jack was getting warm without a coaxial cable connected.  Anyway the modem seems to be working as expected.  However, just to be safe, I just ordered a new S33, in case mine is slowly failing.  With this said though, out of the modems I’ve tried CM3000, and SB8200, the S33 has remained the overall  most stable.  So I’m going to return the SB8200 so I don’t have to pay for a modem I’m not going to use, and just keep the 2 S33’s and Netgear to have a few to switch between in the event of problems.

Thanks again for the help.