Frequent Latency spikes / and loss of internet / looking for next steps

Been Dealing with issue for well over a year.

Frequent internet drops, high latency.

Rebooting modem, entire network often does not fix issue and modem may not connect for hours(like it did several times yesterday.

It rarely affects my two next door neighbors.

everything may seem fine, all data from modem (channels, power, etc seem ok) and then all of a sudden massive uncorrectables and internet will be down and reboot doesn't help.

Fall of 20024:

Xfinity replaced the RG11 from Coax tap at top of pole with rg6. and then replaced old direct burial RG11 with new RG11 in conduit to the house (about 180-200 feet total length. Now RG6 to RG11 and then the rg 6 inside the house)

They replaced the PPC POE / MOCA filter at the house, and then single 2 way Commscope splitter.

At that time I changed from older netgear CM1000v2 modem to arris SB8200. and same issues

Then I had all new rg6 installed from the xfinity commscope 2 way splitter on the side of the house. One direct line to the TV box and one direct line to the modem.

same issues

Modem changed from Netgear CM1000v2 to Arris sb8200

Same issues.

Changed to CM3000 modem yesterday and same issue

I have unifi UDM SE for router and networking

Here is image showing issue over the last week.

Yellow line showing massive latency spikes

Red line showing packet loss spikes

Purple line showing upload

Line below showing "green" when internet ok and red when internet was out. Last night, i would reset modem, barely get it up and running to see netgear stats with massive uncorrectables and it would shut down.

Took many hours for it to come back on line last night.

This morning internet working and saw this on modem:

then I was able to reboot the network

and get

It is making it very difficult to work from home.

It isn't a specific time of day.

Looking for help with further diagnostics or how to document issues.

I don't know if this is problem at the node in area, the tap / feed to the pole from the street.

Should the line from the Coax tap, down pole and to the house all be RG11?

The few techs that have been here, changing the lines on outside....all works when they are here.

Thanks for any advice