Another SYNC Timing Synchronization failure

Hi,

Outside of trying a new modem, everything is new from that point on (router, cables, computer).  Router has been factory reset, firmware updated, and reconfigured.  I have watched the router behavior during one of these outages and it does everything it is supposed to (picks the connection back up once available).  I have replaced all network cables with CAT 8 shielded, tested and personally confirmed with my own multi-meter. The computer is a brand new AM5 setup, with onboard NIC - I added an alternate NIC, via pcie slot, and same results (brand new NIC).

I contacted Motorola customer support, but they were no help and simply pointed the finger at Xfinity. So I had an Xfinity Tech come out and hook his meter up, cleaned the cable jack/replaced something and removed a splitter.  That upped the power level a little, but it was already within spec.  The connection drops, which happen randomly and last for approximately 2 minutes, didn't happen while the Tech was onsite. The Tech said the connection was great.

The sync/channel errors that are occurring output my modem's MAC address and MAC's for the ISP's equipment via the Event Log (as seen above without the MAC's). The occasional T3 timeouts have stopped, there were several Xfinity trucks in the neighborhood on the earlier this week, and they traced an issue to my building (it was happenstance that I ran into the Xfinity worker looking to gain access to our building cables boxes - I have access as I serve on the condo association board).  I haven't had a disconnect since the 26th (but it did happen several times after the Tech had accessed our box). I confirmed with the Tech before leaving the area that the issue was resolved on their end at our box.  Maybe this has resolved the issue...

I have a new modem arriving soon, delayed until next week (different bran/model also on the approved list).  I'm going to give that a try if I experience another drop.

Lastly, I have lived in the same location for the past 9-10 years and I have had rock solid internet connection until now with rare issues (only usually from planned, notified, maintenance).  These drops started at the end of last year after a planned maintenance period in our area.

Tired of the tail wagging the dog.

Thank you for providing those details, @user_error_error. It sounds like the technician replaced all the connection points that were most likely to cause an issue like this, and I'm happy to hear there was some improvement, but it sounds like there may be something else that would warrant a second look. Please let me know if you don't see any improvement when the new modem arrives, and we can work with you to explore other options.