Packet Loss and Latency Spikes

For the past couple of weeks I have been experiencing ping spikes and packet loss, most noticeable when playing games online on my PC. This post is very similar to my experience: https://forums.xfinity.com/conversations/your-home-network/packet-loss-issues/6a125d56125e2a74f0881409

I'm also in the bay area, CA for what it is worth. I've gone through all the troubleshooting steps mentioned there, namely:

• Full modem/gateway reboot (or cold reboot)

• PC reboot

• Ethernet troubleshooting

• NIC power-saving settings disabled

• Link speed testing (5Gb and 2.5Gb)

• Continuous ping monitoring

• PingPlotter monitoring

• Testing both local gateway and external targets

• Confirmed issue affects multiple devices/users in the household, not just one PC

My tests with pingplotter are showing packet loss a few times every 10 minutes, which has been quite frustrating. I'm wondering if there is a way to check if this is related to some node congestion, upstream instability, signal noise, or packet loss history on the line. 

Any help would be appreciated, as this makes online gaming very bad and also has more minor impacts on things like streaming or online meetings.