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The upstream power is too high and it may be intermittently fluctuating even farther out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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Good luck with it !
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The splitter should really be a 5 to 1002 MHz one.
Here are some quality brand splitters that Comcast actually uses in different market areas;
Antronix CMC2002H 2-Way Splitter: http://www.amazon.com/Antronix-CMC2002H-2-Way-Splitter/dp/B001E4OH1E
Regal 2 WAY 1 GHZ Splitter: http://www.amazon.com/DIG702867-Regal-WAY-GHZ-SPLITTER/dp/B0018BQMUM/ref=sr_1_2?s=electronics&ie=UTF...
Extreme Broadband BDS102H 2-Way Digital Coax Splitter: http://www.amazon.com/EXTREME-DIGITAL-PERFORMANCE-CABLE-SPLITTER/dp/B007YV0UQW
Holland 2-way horizontal splitter 5-1000 MHz with ground.http://www.3starinc.com/holland_2-way_horizontal_splitter_5-1000_mhz-w-ground.html
Sv-2g 2-way Splitter 5-1000mhz: http://www.amazon.com/Sv-2g-2-way-Splitter-5-1000mhz-Sv2g/dp/B003TH36CK
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If you don't get any joy, then as stated, you should get a tech out to investigate the problem.
Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !
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The power levels don't lie. There is a line impairment somewhere and it will remain no matter what modem is used. It's just that some makes / models of modems are more tolerant / forgiving of less than stellar quality. Good luck !
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Hi, @tpoynton! Thanks for using our Forums page to reach out for help with the internet service concern! At Comcast, we strive in ensuring that you receive the services that you pay for. Are you still experiencing any internet service issues?
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That is still on the high side but is o/k as long as it remains stable. Hope things hold up for you. Good luck !
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Hi tpoynton. Apologies you are again experiencing trouble with your internet. To begin troubleshooting this morning, I'd like to perform a diagnostics on signal being sent to and from your modem. If you would like assistance, please send me a private message and include your full name and service address, so I can access your account. Send me a private message by clicking my profile name (ComcastJoeTru), then click "Send a message".
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