@CCAndrew just switched to Netgear CM 1000 and changed to 1Gibt plan. Getting speeds <100mb. Contacted Netgear and they confirmed modem is fine. Upstream & downstream power levels are not within acceptable range (-7 to +7 and 38-48). Field tech visited last week and confirmed no problem with Xfinity provided modem. This is my 2nd 3rd party modem from Amazon and i have a hard time believing it's 'another' defective one. Hoping you can help.