Unifi camera feed in Frigate card cause ISP to disconnect

Bit of a weird one this but I have some Unifi Protect feeds showing in Frigate cards in Home Assistant. When I try to remotely load the view the internet connection at home completely disconnects for a while. Interestingly this doesn’t happen if I use the Unifi web interface or Protect app. It seems like the ISP (Plusnet in UK) is blocking outbound rtsp but I’m not sure why the protect app would work in that case. Does anybody know what might be going on and how I can resolve?

Thanks!