Your Signal Power levels are bad. The Downstream is averaging around -11dBmV, it should be at 0 dBmV. The operating range is spec'd at +15 to -15, but realistically they should normally be well within +10 to -10. You're only showing one upstream channel as well. Don't know if you were not able to copy everything but there should normally be 3 upstream channels, possibly even 4 for higher rate service plans. That channel is also showing a very high signal power level of +58 dBmV. It should typicallly be in the 37 to 40 dBmV range. So, you need a tech to inspect the external cable and connectors. They don't last forever and every once in a while need replacing. Do you have any other services with Rogers and if so, do you notice any problems with those services?
Do you happen to use any type of surge suppressers for your RG6 cable which connects to the modem? If so, disconnect the cable from the surge supresser and connect the modem directly to the connector on the wall outlet. Surge suppressers can cause numerous problem, mainly reduced signal power levels at the modem. If you use a power bar of any type, disconnect the power bar completely from your devices and the wall outlet. I've seen cases recently where the power bar generated enough RF noise that it was bleeding into the RG6 cable into the modem, dropping the signal to noise ratios to the point of being a real problem. Connect your devices directly to the wall outlet if you can, or use an extension cord for test purposes until this is sorted out. If and when you have disconnected from any power bar and surge suppresser, have a look at your signal power levels. They should be closer to 0 dBmV on the downstream side and you should see three upstream channels with signal power much closer to the 37 to 40 dBmV range. If that doesn't happen, its time to call tech support and arrange for a tech visit. In either case, with or without a power bar or surge suppresser, can you have a look at your upstream channels and confirm for us that you only show one channel up? Can you also repost the numbers if you were previously using a power bar and surge suppresser?
The issue of using a power bar or surge suppresser is important. If you have a tech come in to check out a problem, and it turns out that the cause is one of those two items, you will most likely end up paying for the visit as the problem is with customer equipment. If the issue is with the cabling and connectors it will be a freebie visit which should clear up your data rate issues.
Edit: Fwiw, if you do any online gaming, give the CGN2 a go first before deciding to move up to the CGN3. There are issues with latency within the CGN3 among other issues. So, yes, faster data rates are possible with the CGN3, but latency issues may make you wish you hadn't moved up. Hopefully the next firmware release will solve some of those issues. Here's a link to a summery that I posted on the CGN3.
