Constant disconnects - Xfinity cant detect signal - Netgear CM1150V Modem

ok, so an Xfinity guy came out Tuesday and did a test at the outside connection of the house. There was a 3-way splitter he replaced. One line runs into the house that goes to a DVR cable box. Two other lines run up the house behind the gutter, one going to where the modem is, the other eventually to the master bedroom is. Once he disconnected the line that ran to the bedroom, he said the noise 'hump/spike' in the line went away. We switched that out for a wi-fi secondary tv box instead of the hardwired one.

Yesterday had no problems at all.  Today, my wife (works from home) said she's had to disconnect it twice. Only new variable is that my son is home from my in-laws now.  I have him and my daughter BOTH on Chromebooks and BOTH on Roku TVs.

Wife just checked the modem Event Log and this was our recent stuff, stil has T3 errors (see examples below).

Is this still potentially a modem issue/something with Xfinity, or maybe just network congestion? She also just noticed the modem is set to central time (i'm translating/relaying over chat) and we are Eastern, is that an issue?

CRITICAL (3)   Started Unicast Maintenance Ranging - No Response recieved - T3 time-out; CM-MAC=08:36:c9:37:eb:50;CMTS-MAC=00:f3:c8:05:e5:5d;CM-QOS=1/1;CM-VER=3.1

WARNING(5) Dynamic Range Window violation

WARNING(5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=08:36:c9:37:eb:50;CMTS-MAC=00:fe:c8:05:e5:5d;CM-QOS=1.1;CM-VER=3.1;

CRITICAL(3) No Ranging Response recieved-T3 time-out;MAC=08:36:c9:37:eb:50;CMTS-MAC=00:f3:c8:05:e5:5d;CM-QOS=1/1;CM-VER=3.1