Intermittent dropouts many times per day - Xfinity Gigabit internet

Start here;

https://forums.xfinity.com/t5/Your-Home-Network/Internet-Troubleshooting-Tips/m-p/3310447#M316652

My router is a Comcast one. I have this issue on a directly-connected laptop and my wi-fi connected desktop. Downstream DNRs are 40.3; Power ranges +6.5 to +8. My upstream power is +39. Zero correctable/uncorrectable codewords.

Logs (yesterday option):

System: just one Admin login

Event:

ti_dhcp6c[12589]: 72001011-DHCPv6 - Missing Required Option 82	2020/6/11 19:41:11	Critical
ti_dhcp6c[12589]: 72001011-DHCPv6 - Missing Required Option 24	2020/6/11 19:41:11	Critical
ti_dhcp6c[12589]: 72001011-DHCPv6 - Missing Required Option 82	2020/6/11 19:41:01	Critical
ti_dhcp6c[12589]: 72001009-DHCPv6 - No Advertise or Reply Received 1 times	2020/6/11 19:41:01	Critical

 

Firewall:

FW.IPv6 FORWARD drop , 5507 Attempts, 2020/6/13 09:20:24	Firewall Blocked
FW.IPv6 INPUT drop , 8920 Attempts, 2020/6/13 09:20:16	Firewall Blocked
FW.WANATTACK DROP , 18 Attempts, 2020/6/13 09:10:36	Firewall Blocked
FW.WANATTACK DROP , 11 Attempts, 2020/6/11 19:41:11	Firewall Blocked
FW.IPv6 FORWARD drop , 4743 Attempts, 2020/6/11 19:40:37	Firewall Blocked
FW.IPv6 INPUT drop , 8320 Attempts, 2020/6/11 19:38:37	Firewall Blocked

 

Cabling is tight and undamaged. Onky one splitter in my outside box. Signal booster (at the gateway, placed by Comcast) is plugged in and connections are tight.

Pings and traceroutes to a variety of locations are normal.

 

What else?

I am beginning to suspect it's the gateway itself.

Side note: Photo below of a Netspot scan done just now - I'm connected via the highlighted (purple) row.

I mentioned this in my earlier post, but yes, my work laptop is where I have the biggest issue, and it’s hardwired to the gateway. I Usually only notice it during Skype, Zoom and (sometimes) Teams meetings. It will disconnect entirely once in awhile or drop audio for 10-15 seconds (most of the time), then come back. This will happen about every five minutes.

If I power cycle the gateway sometimes it won’t do it for a whole day, sometimes it makes no difference.

I’ll look for an image posting site soon.

Here's the image showing my (purple) signal: https://imgur.com/a/kL0kOKi