Intermittent daily Connectivity issues SB8200

Hello, 

After dealing with this over several weeks , which included several contact by phone & IM with Xfinity support. I thought I'd try here.  The issue seems to occur mainly durring specfic times of day  (currently around 9-11am , and again in afternoon from 4-7pm) .  The outages last anywhere from brief 1 ping lost to 10 minutes.. of complete outage.. They occur repeatedly within those windows, making my work from home extreemly difficult at those times.  The steps I have tried  include the following (multiple times for each):

 

- Checked all connections as tight..etc

- Watched the video for gigabit issues 

- Restart Modem SB8200, manually and via comcast app

- Disconnect router , & connecting directly to Desktop pc

- Have comcast test connection while the issues were occurring 

- Push Factory reset button on Modem SB8200 (*see far below note)

- noted Modem is seening Numerous Uncorrectables

- After factory reset, Corrected/Uncorrectables stay at 0 until I start seeing connectivity issues then they spike as below.

 

PLEASE HELP , has been going on for months 🙂

 

Numerous Uncorrectables

 

 

* The one instance I hit the factory Reset durring an episode I got the following in the Event log, subsequent resets and restarts have shown nothing .

 

7/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 2436694061 5 "Dynamic Range Window violation"
07/07/2020 10:55 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=....
07/07/2020 10:55 84000500 3 "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=....
07/07/2020 10:55 67061600 6 "DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=....
01/01/1970 00:01 2436694066 6 "Honoring MDD; IP provisioning mode = IPv6"
01/01/1970 00:01 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=....
01/01/1970 00:01 84020200 5 "Lost MDD Timeout;CM-MAC=....
01/01/1970 00:01 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=....
01/01/1970 00:01 84020200 5 "Lost MDD Timeout;CM-MAC=....
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=....