How my brother's constant buffering issues improved my diagnostic skills
He kept complaining about slow video streams, so I traced it to a bad splitter. Now I always test signal strength at every outlet. What's your first diagnostic step?
Have you ever asked what devices are on the network before testing outlets? I always look for things like smart TVs or phones sucking up bandwidth (it's crazy how much they use). Your splitter story is a good reminder to check hardware, but sometimes the fix is just telling a roommate to stop streaming in 4K while gaming. So my first move is to see the big picture of what's connected and when.
How often do you actually see every single thing connected? I once tracked down a mystery device that turned out to be an old tablet, forgotten in a drawer, still updating apps.