Act all suspicious.

I pay for 150 Mbps internet service and I'm getting very inconsistent results at speedtest.net, only getting between 11 and 24 Mbps down. My upload is sometimes higher than the download which is uncommon for home services and not what I'm paying for. Here's some screenshots from speed test runs including a screenshot of the monitoring graph from my OpenWRT router. Notice the strange drop off in the middle of the test run. A major sign that points me toward a bad cable modem rather than problematic lines from the ISP is: earlier this morning, I lost internet -only power, link, and DS light (flashing) were lit- and I tried unplugging/re-plugging the barrel connector to power on the back of the modem to no avail... same indicator lights, no internet. This was with a 2-4 minute cooldown period. Then I tried unplugging the modem barrel connector and letting it cool down for 30 minutes to ambient temperature; it didn't turn back on at all (no lights) when...