Having a few Netgear GS724T v3 switches across multiple sites, I’ve suffered constantly with ports going to sleep and occasionally not waking up when something is plugged in (or a PC in sleep coming back on).
Through much trial and error, I have a solution that appears to be working for me, and no more issues since I made the changes in Spring 2017….
…disable Auto Power Down in the green Ethernet settings!
I’m sure the tree hugging hippies will be up in arms over that, but tough.
