Repair tech says line looks great.
Since problem got noticible after line speed upgrade,
and since I had a WesTel 2110 (old) modem,
The tech recommended we swing by the office and pick up a new modem.
So, we did, and we got a WesTel 6100.
This is about a quarter of the size, and includes a decent function router.
We'll see how it works, but I like getting PVC stats:
Transceiver Revision: 126.96.36.199 Vendor ID Code: 4 Line Mode: G.DMT Mode Data Path: Fast Transceiver Information Down Stream Path Up Stream Path DSL Speed (Kbits/Sec) 7168 896 Margin (dB) 20.0 10.0 Line Attenuation (dB) 16.5 11.0 Transmit Power (dBm) 19.7 11.9That's a pretty decent connection.
Anyway, I'm still configuring port mapping.