High Latency and Packet Loss - Menlo Park

The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

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.

Thanks kindly for your response.  I current have a single splitter (it's a 1 in 4 out but only 2 outs are used:  cable modem and to TV box).  It is supposedly high quality, a digital splitter by Evoluation 5-1002 MHz.  Frustrating and Comcast won't roll anyone until COVID is over.

Reduce that splitter down to being a 2-way splitter if you don't need that many ports. It has less signal loss.

Ok, I'll give a try.  All I have lying around is an older Monster Cable 2G splitter, one of the "gold" ones you advise against.  Waste of time?

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

Thanks, again.  I got the Extreme 1-2 splitter and installed but to no avail.  Got a lot of error messages on my modem this am (before I installed the new splitter):

No Maintenance Broadcasts for Ranging opportunities received - T2 time-out

No Ranging Response received - T3 time-out

SYNC Timing Synchronization failure - Loss of Sync

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing

Current cable snapshot:

The upstream power has more wiggle room.

I finally got a truck roll to the house tomorrow.  They called me this afternoon and said they fixed something but nothing is fixed.  Quite frustrating.  Here is the latest ping and modem report.

Comcast ultimately fixed an issue in our node of the network.  That solved it.

Glad that it got straightened out. Good luck ! Now closing this thread.