Upstream change at the neighborhood node causing speed drop, modem cannot speak to neighborhood node. Modem stuck in IPv6 Provisioning Mode

Yes.  The Xfinity app is unable to identify an issue because the signal strengths are generally good. It is not seeing the problem on Downstream OFDM Channel 1 (Channel ID 37, 690MHz).  I also have spoken to support twice now, and have asked for a T3/Profile Reset.  If they did send the reset my modem hasn't received it, it is still forcing IPv6 Only provisioning mode. The modem is able to receive docsDevReserNow commands from the network, however.  Please see logs below from yesterday at 1:40PM ET (time is off because modem is not receiving responses to ToD requests):

Mon Aug 10 12:40:27 2026 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=0[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Mon Aug 10 12:40:23 2026 Notice (6) TLV-11 - unrecognized OID;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6

Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

Mon Aug 10 12:39:11 2026 Warning (5) ToD request sent - No Response received;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Mon Aug 10 12:39:11 2026 Critical (3) Resetting the cable modem due to docsDevResetNow