yeah man run a pingplotter to comcast.net bet you are having the same issue I'm having. Sure glad I've paid to the tune of almost 2k a year to these special snowflakes to give away free wifi to all the homeless from inside my house! I don't think it will ever be fixed! I can't game and it's all I use the internet for outside of work, which I also can't do.
Its running a ping to each hop on the way to your address and normalizing the values from my understanding. What you are seeing with the fluctuations is the differences in milliseconds the server responds to each ping or request. What you should be REALLY paying attention for is massive spikes, 30-60 maybe 70 ms is OK anything higher for most speed sensitive applications. The RED bars indicate dropped or lost packets, these are PINGS that did not get there or did not get responded to. There can also be a delay in packets, this can be caused by things like buffer overfloat and poor traffic routing which causes JITTER which is the big thing to look for. Jitter is the out of order receipt and transmission of the packets iirc. I dunno I could be way off, it's been a really long time and I'm in management and I pay people for this stuff anymore...
this is what mine looks like running an hour or so to ping LOL's NA servers.
Count me in on this issue, random latency spikes are cause my connection to slow to a crawl. Very frustrating. I was chatting with support and they "sent settings" & reset my modem and things were better. I even waited a few minutes after they reset it and Pingplotter was all green with low latency to several DNS servers on the Internet (One of them being 22.214.171.124)
As soon as they disconnected, everything spiked and latency and packet loss began again. It almost feels like something was changed on my connection just until I got out of chat. Odd coencidence perhaps?