A further update:
1. The problem-free session lasted about 3 hours, before the Internet speed "crashed". We just had to disconnect the laptop if we needed to access the Internet. We switched off all...

Hi,

I have a HP laptop that has developed the annoying habit of making our LAN extremely slow.

Using speedtest.net as a guide, I typically get 1.3Mbps download speeds with our 2x desktops...