Intermittent packet loss.

Have been having this issue for about 6 months and has progressively gotten worse to the point its unbearable. Have replaced Cables, Modem and ISP says the line is fine. Network is Australian NBN HFC connected through Ethernet.

This issue is across the entire network and not one device.

Could anyone please give me some troubleshooting tips. Is there a way to find out if this issue is actually within my network or ISP? https://share.pingplotter.com/M13tbWJL32K