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[Internet] Signal Levels / Logs / Losing connection intermittently

I'm having a problem where my internet will drop for 20-30 seconds, multiple times per day... Doesn't seem to impact TV, so I don't think it's a physical plant problem.

Roger's tech doesn't see anything when they check it... Signal levels look good to me, as well, but I'm looking for a second opinion.

Also, there's a message that keeps repeating in the modem log :

"Received Response to Broadcast Maintenance Request, But no Un.."

but no idea if it actually means anything, or corrisponds to the issues I'm having.

As you can see below, it's the Cisco DPC3825, I'm on Extreme (I think?) - setup has been static (modem, router, wiring, etc) for probably 6 months, nothing's been changed or moved around or updated. Issue's new in the last 2 weeks or so.

Model: Cisco DPC3825
Vendor: Cisco
Hardware Revision: 1.0
Serial Number: xxxxxxxxx
MAC Address: xx:xx:xx:xx:xx
Bootloader Revision: 2.3.0_R3
Current Software Revision: dpc3825-v302r125533-111108a-ROG
Firmware Name: dpc3825-v302r125533-111108a-ROG.bin
Firmware Build Time: Nov 8 18:12:42 2011
Cable Modem Status: Operational
Wireless Network: Enable
Cisco Logo

Cable Modem State
DOCSIS Downstream Scanning: Completed
DOCSIS Ranging: Completed
DOCSIS DHCP: Completed
DOCSIS TFTP: Completed
DOCSIS Data Reg Complete: Completed
DOCSIS Privacy: Enabled

Downstream Channels
Power Level: Signal to Noise Ratio:
Channel 1: 1.5 dBmV 36.7 dB
Channel 2: 2.6 dBmV 37.9 dB
Channel 3: 2.0 dBmV 37.6 dB
Channel 4: 1.7 dBmV 37.3 dB
Channel 5: 1.9 dBmV 37.2 dB
Channel 6: 1.7 dBmV 37.2 dB
Channel 7: 1.6 dBmV 36.9 dB
Channel 8: 1.8 dBmV 37.1 dB

Upstream Channels
Power Level:
Channel 1: 34.5 dBmV
Channel 2: 34.2 dBmV
Channel 3: 34.7 dBmV
Channel 4: 0.0 dBmV


Your downstream signals are great ... but the upstream is really strange in that it's SO low, right to the point that there could be problems there. With your downstream I'd expect to see about 40 dBmV on the upstream.