Like many others here i'd first like to offer my deepest thanks for Pingplotter, its a wonderful tool that really helps with monitoring and troubleshooting.
I had my connection for a long time, and recently noticed a tendancy at 30mins past the hour for it to go completely ape. I started to monitor it (again) and discovered a rather debilitating problem that seems to occur on an hourly basis.
Suddenly the connection (which is normally very stable) will experience extreme ping/packet loss which quickly spreads to every hop until eventually they all register 90/100%. As you can see other than this period the connection is perfectly fine. I'd had multiple computers and two modems....all show the same issue.
I was hoping someone might know what is causing the problem and who better to ask than the people who make/follow PingPlotter! If anyone has any idea, please could you tell me so i can better approach my ISP (if that is indeed the issue). Thankyou in advance.