Internet dropping

It appears your upstream signal levels are out of specification on the low end.  Do the lines to the modem pass through any sort of amplier that may be installed?

No, there's a single splitter between the service connection point and the modem.  I've tried removing that as well and the values don't change.

It may be beneficial at this point to arrange for a technician to come out and take a look at those signals to see if anything else can be done to improve them.

I tried switching to a different modem I had and the problem continues.  The logging on this modem is not as detailed (kind of annoying since its locked down choice by the ISP).  The upstream and downstream power levels seem to fluctuate widely during the periods when loss of connectivity happens.  Generally between about 4pm and 11am the connection will drop every few minutes.  Sometimes it will last 30 minutes or so and then fail.  When it fails, one or more of the upstream channels will drop to 0dBmv and stay there, then a few minutes later another will drop.  Once all of them have failed the connection is obviously not working and the modem will eventually reboot and start the process all over again.

I've tried connecting the modem directly to the service entry point and that doesn't solve the problem.  Can we setup a service visit through the site to have someone come out and resolve this.  The problem has been happening for months on multiple different modems and I'm about ready to switch to another service with how frustrating this is getting.

Here's a random signal reading sample from this modem:

Model: Cisco DPC3010

Vendor: Cisco

Hardware Revision: 1.0

MAC Address: 7c:b2:1b:ac:20:c4

Bootloader Revision: 2.3.0_R1

Current Software Revision: d3000-v302r125533-120716a-COX

Firmware Name: d3000-v302r125533-120716a-COX.bin

Firmware Build Time: Jul 16 17:16:46 2012

Cable Modem Status: Operational

--------------------------------------------------------------------------------

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: 2.1 dBmV 41.2 dB

Channel 2: 2.0 dBmV 41.0 dB

Channel 3: 1.8 dBmV 40.5 dB

Channel 4: 1.5 dBmV 40.4 dB

Channel 5: -2.4 dBmV 40.3 dB

Channel 6: -2.6 dBmV 40.1 dB

Channel 7: -2.9 dBmV 39.6 dB

Channel 8: -3.1 dBmV 39.9 dB

--------------------------------------------------------------------------------

Upstream Channels   

     Power Level:

Channel 1: 34.7 dBmV

Channel 2: 42.4 dBmV

Channel 3: 44.7 dBmV

Channel 4: 41.9 dBmV

You've still got one upstream channel showing abnormally low levels, especially relative to the others.  Did you ever have somebody come out and look at that?