High packet loss

Hello!

Firstly, just want to say that I’m not from the most networky background - more live events type stuff.

I’m setting up a small-ish network, and am having an issue with constant ~12% external packet loss and every few minutes the connection is lost for 20 seconds or so. When I connect the WAN directly into a PC I get 0% and it’s very stable. (Using StarTrinity continuous speed test to monitor).

I’ve tried resetting the router (a Cisco RV345) to factory settings to see if it’s anything I’ve done setting it up, but it’s exactly the same on a fresh config. Have obviously double and triple checked the WAN IP details.

Any ideas?