22 Messages
Intermittent connection
hello everybody, I see a lot of people struggle with this issue. Was wondering if anyone had a solution, about 5 PM every day for the past three weeks until 8 PM my Internet drops and show slow speeds especially on the upload side, I’ve had a tech come out replace modem as well as run new coax cable, bypassing splitter, none of this has solved the problem. They have another schedule for Monday. Was wondering if anyone knew from their experience a solution or what the problem is thank you. Have a good day.
EG
Expert
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107.1K Messages
5 months ago
Please start here if you wish;
https://forums.xfinity.com/conversations/your-home-network/connection-troubleshooting-tips/602da777c5375f08cdea3db9
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EG
Expert
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107.1K Messages
5 months ago
@user_13yzmd
Quite welcome ! SNR values that are in the forties are very good ! Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
What is the exact make and model number of the modem / gateway device ?
Is this with a WiFi connection ?
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EG
Expert
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107.1K Messages
5 months ago
This may or may not be the root cause of the problem (YMMV) but it should be addressed regardless.
The downstream power is too high. It may be over-driving the front-end receiver circuit of the modem. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
Is there a drop amplifier on the coax cable line leading to the modem ? If so, try removing / bypassing it and see. If not, you can try installing a -6 dB forward path-only attenuator pad such as this one on the coax port on the rear of the modem to knock that power level down and see;
https://www.amazon.com/FPA6-54-Forward-Attenuator-DOCSIS-Internet/dp/B08KTRC3XZ
It won't affect the upstream power level which is within spec. Good luck !
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EG
Expert
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107.1K Messages
5 months ago
Possibly. Good luck with the tech visit ! Please post back here with how it goes.
FWIW. They have those attenuators at Walmart;
https://www.walmart.com/ip/PPC-FPA6-54-Forward-Path-Attenuator-6dB-75-Ohms-for-DOCSIS-Cable-TV-Modems-and-Boxes/218434084
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user_13yzmd
22 Messages
5 months ago
it seems my DHCPv6 needs to be reconfigured
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user_13yzmd
22 Messages
4 months ago
update
Still no fix
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user_13yzmd
22 Messages
4 months ago
update. 7/22/24 issues still not fixed with 3rd modem….. very frustrating and disappointed. It would seem xfinity has an issue with PlayStation that I believe is causing the firewall to trip and block all traffic on the IPv6, this is because the problem is the same across all modems….. I’ve had coax replaced as well…..
firewall logs in admin center show constant drops
network test on app show it’s fine but on devices it’s slow speeds
the port forwarding only works for IPv4 so I am out of luck there
DMZ didn’t work
unchecking Stateless option on IPv6 didn’t work
ive tried everything but switching ISP
which seems to be next never had this type of issue with AT&T
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user_13yzmd
22 Messages
4 months ago
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user_13yzmd
22 Messages
4 months ago
(edited)
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user_13yzmd
22 Messages
4 months ago
ive been having connection drops and upload speed loss for a month and a half, ive had 5 modems, a new line put in, as well as the node switched.... still i am told that everything looks fine and i need to pay more money so my speed can be compatible with my modem, i dont buy that for a second. [Edited: "Soliciting"]
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user_13yzmd
22 Messages
4 months ago
Silencing my post on here is crazy
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