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Sunday, March 5th, 2023

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MT8733 - 2.4 Ghz Wifi Drops, 5Ghz Wifi Remains Connected

I have a Motorola MT8733 on Xfinity's 1200Mbps plan.

Randomly throughout the day, my 2.4Ghz wifi band drops connection to all devices. 5Ghz wifi band and hard wired connections remains unaffected. The issue remains until I either reset the modem via the modems UI itself, or via the Xfinity App. There seems to be no pattern in the problem, sometimes it happens in the middle of the night, sometimes during the day, but it happens at least 2-3 times a day

Some specifics about my setup... I have Band Steering Off, with two different SSIDs, one for 2.4G and one for 5G. On 2.4G I have the Channel set to 11 and Bandwidth at 20Mhz. I have played around with the channels, 1, 6, 11, auto, but none seem to help the situation. I have no other customizations on my modem. I do have about ~30 devices connected wirelessly to 2.4Ghz, but my older modem was able to handle this fine. Further, I have a tough time believing this is signal interference. During the disconnection phenomenon I'm able to run a Wifi Analyzer/Scan and see that 2.4Ghz signal never really drops below -45dBm. Even as all of my 2.4G devices are disconnected, I am still producing a strong signal, just unable to connect to it or the internet. The 2.4G band will even continue to show as an option on my computer/phone, but you're unable to connect to it until I reset the modem. Lastly, I've even installed a smart plug that restarts my modem nightly, but it still hasn't solved my issues.

This disconnection event creates no information in my modems logs. I do randomly get the following log events, but they do not sync up with the time that I get the problem:

   11:45:00
Sun Mar 5 2023   Critical(3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
    11:45:17
Sun Mar 5 2023   Warning(5)   RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
    11:45:18
Sun Mar 5 2023   Warning(5)   Dynamic Range Window violation
    11:45:18
Sun Mar 5 2023   Warning(5)   RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
    11:45:18
Sun Mar 5 2023   Warning(5)   Dynamic Range Window violation
    11:45:18
Sun Mar 5 2023   Warning(5)   RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;
    11:45:18
Sun Mar 5 2023   Warning(5)   Dynamic Range Window violation
    11:45:18
Sun Mar 5 2023   Critical(3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XX:XX:XX:XX:XX:XX;CMTS-MAC=XX:XX:XX:XX:XX:XX;CM-QOS=1.1;CM-VER=3.1;

Other threads that note these issues seem to point to line interference. For my situation there, the Xfinity box is on the outside of the house... but months ago we had a tech come out and drill a hole directly in to the side of the house... so the line goes from the box to a singular wall outlet, and I'm only able to use that one outlet for my modem. No kinks, critter interference, splitters, etc.

Possibly an aside from all of this, my internet connection is much slower than expected. Even hardwired directly to the modem, my speed never reaches above 130-150mbps. I realize getting to 1.2Ghz is unrealistic, but in my opinion this is slow for the most premium service offered.

One thing I have seen on these forums is receiving a "reprovisioning signal" from Xfinity. I admittedly am not entirely sure what this does, but I feel like I'm running out of options and this would be something that's worth a shot.

Please let me know if I can provide any additional details.

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