Intermittent Service Drops Related to T3/T4 Time-outs

On a daily basis, I have been experiencing multiple drops in service ranging in severity from a few minutes (until modem reset) to greater than an hour. I utilize my own modem and router for my service. The modems in-use are identified in my discussion below. I have brought this issue to Comcast's attention via a tech visit on May 19th; however, the issue has persisted following the visit. 

I have taken many steps to troubleshoot the issue on my end (including all those listed by Comcast in their Troubleshooting Tips) with none providing a permanent resolution. A general synopsis of the troubleshooting steps taken include:

• Removed all unnecessary splitters within my home. All equipment (modem, main cable box, and one satellite box) now have a dedicated line from the one and only splitter located at the drop line connection to the house. The Comcast tech also replaced this splitter during his visit to be safe.
• All coax cable runs and F-connectors within my home have been replaced and verified to be in good condition by the Comcast tech.
• Three different modems have been activated and used over the last few months (Arris S33, Motorola MB8611, and Arris SB6190). This was done to verify (1) there was not a fault with the modem and (2) there was not a discrepancy in service between the DOCSIS 3.1 and DOCSIS 3.0 standard at my location. Each modem was factory reset after the issues persisted. The factory resets did not improve the drop outs.
• The Comcast tech verified the signal to my home at the drop location was above average (as my drop is run to my house off an amp located off the pole across the street). He did not, however, acknowledge that my issue was identified as being intermittent and thus potentially unidentifiable during the time of his visit.

Over the time the issues have been occurring, I have also captured various snapshots of my modem performance via channel status and event logs to provide a clearer picture of my issue. As mentioned, the information was captured for three different modem models. This information relative to representative drop out occurrences is provided (with MAC addressed removed) in the links below:

• Arris S33 Channel Status & Event Log
• Motorola MB8611 Channel Status & Event Log
• Arris SB6190 Channel Status & Event Log

From my interpretation of the modem information, the downstream SNR and power levels are well within spec. The upstream power levels are also within spec. However, the number of uncorrectables that are correlated to the T3 and T4 time-outs are unacceptable. The event logs seem to indicate that there is an intermittent issue with upstream communication.

Taking into account this information and all the troubleshooting steps I have taken, I believe there to be either (1) a potential issue with the drop line providing service to my house or (2) an issue on Comcast's end related to the firmware/configuration provided to each modem. I am no expert, though, and I am open to exploring options that achieve an expedient solution to my issue. If someone could please provide me with a clear path forward taking into account this information, it would be greatly appreciated. Thanks.