Thank's for the reply Poe!

The cable to my PC to router is a CAT 5 router, when I changed it for a CAT 7 router there was no changes to packet loss so we can assume that that's not an issue.

The cable from my router to modem (which goes across many rooms), as far as I know isn't even CAT 5.

I'm not so sure what's a good cable, if I have a CAT 5 cable from the router to modem, is that sufficient?

Thank you so much Poe.