I've been having an ongoing problem with my internet speed dropping off, and could use some help making sense of it.
Essentially, I notice that occasionally (& regularly) the speed drops off a cliff, which typically results in streams that I'm watching in buffering. When I run a speed test, I pretty much always see the fast speed advertised with my service.
So I tried out testmy.net, running an automatic download test every 5 minutes for 8 hours. The resulting graph looks like a saw blade. Every 3 or 4 intervals, the speed is very slow: https://testmy.net/quickstats