Ongoing Intermittent Connectivity loss

We've been seeing intermittent drops in our internet connection since upgrading to faster service back in Feb. Sometimes it only lasts a few seconds and other times it's out for an hour or more. We've called support multiple times.. We've had a technician on site at least 4 times, but by the time they get here, we're back up and running and they 'don't see anything wrong' and leave.

On the last visit, I was finally able to talk them into replacing our cable modem (Netgear CG3000DCR) since it was to my knowledge, the only thing that has changed since upgrading. It seems to have helped a bit, however we've had two days in the past two weeks where we had intermittent connection drops throughout the day. It's posing a huge problem for us, since we host the data center for a global business. We have users calling and complaining that their VPN sessions keep dropping, or that e-mail is out. It's getting really frustrating.

One strange thing thatI have noticed, is that often times when our connection drops, I can run a speed test and get a normal download speed, but a timeout when the upload test tries to run.I've tried different sites and I get the same results. I've heard of issues with SNR and high upstream power levels causing Ranging response issues, but I'm not sure whether or not that is our problem. I also can't seem to access any type of event logs on our cable modem to find out if there are errors. Does anyone know where to find that on the CG3000DCR? I've looked everywhere and it doesn't seem that we have access to that.

This is what I'm seeing in the modem..

8 downstream channels - Downstream power ranging from 0.5-1.9 dBmV with a SNR from 37.1-38.2 dBmV

2 upstream channels - Upstream power at 51.2 dBmV (could this be an issue?)

Any assistance would be greatly appreciated! 

Thanks,

Doug