Who is your ISP?

[energyx]

Motorola SB5100 cable modem. Works fine.
Address 192.168.100.1 yields displays from modem. One is signal conditions. Watching this over time will tell you if things go marginal due to a flakey coax or system problems on their side. Also compare to neighbors'.

My signals are always -6 dBmV down, 39 dBmV up and 37-39 SNR. I doubt my signal is the problem. So far since I moved the ATA behind DD-WRT, there have been no problems. It makes no sense to me, but I'll update if we see any more anomalies.

Edit: To add, my pings to modem are 3.5ms solid, 8.5ms to the modem gateway and 25ms to Google's DNS servers.