Cable modem: SB6183 modem (one old, one new, read below)
Router: Netgear R7000
Cox speed tier: Preferred 50/5
Splitters: None, modem drop was relocated a couple of years ago and all other cables in the house were disconnected. There is a -9db attenuator installed directly on the modem as a result.
So in the past few weeks I've noticed that my normally-rock-solid internet connection (Cox Preferred, 50/5 Mbps) has become increasingly flaky. When it got particularly bad yesterday, I checked on the modem logs at 192.168.100.1 and saw a rash of T3 / T4 timeouts. I rebooted the modem and watched the stats page for 15 minutes, and got this:
[att=1]
[att=2]
It's worth noting that speeds are fine when everything is working, but the connection becomes incredibly unreliable - up to and including a hard-down condition where nothing can even reach 8.8.8.8 / 8.8.4.4.
Because I am always reluctant to deal with first-level Cox techs on support issues, even though my old 6183 is only about 15 months old, I went ahead and picked up a new one and swapped it just to rule it out. I have yet to experience any flaky connections, but I figure these signal levels and uncorrectable counts after about three hours of uptime are still worthy of concern:
[att=3]
[att=4]
While I never got a screenshot of it, the "old" 6183 did this for a long time - high uncorrectable counts on only four channels. However, the connection didn't become poor until I started getting high uncorrectable counts across the board.
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