I just had this issue on my CM2000 that is less than 5 months old. All lights flashing rapidly with no comms. I attempted every reset mode available without success.
I am not familiar with Netgear's warranty policy - I have active hardware warranty for the first year but because I didn't pay for extended support, I can't actually use the 12 month hardware warranty after the first 90 days? What kind of a policy is this? I can't remember the last time I purchased a premium electronic device that didn't carry at least a one year warranty included in the purchase price. Why else does the CM2000 carry such a premium price tag?
In 22 years of cable broadband, I've actually never had a modem fail, let alone after 5 months of service. For Netgear to completely abandon customers of such a lavish (overpriced) cable modem after 90 days is absolutely pathetic. This thing costs 2X what most 1Gbps+ capable models cost but I honestly purchased it because it looks nice sitting next to my AX6 router. That was a mistake and I can't believe Netgear would abandon customers like this.
