I've had an Orbi router for nearly 3 years, and our own modem for much longer than that. I guess both my provider Mediacom and Amazon are guilty of mislabeling.So, your MOdulator/DEModulator died (These haven't been around for ions. I get a kick out of how many things are mislabeled these days). That said, you need a router. And I'd recommend you get something YOU can manage. Most allow management, but ISPs generally discourage it because most people don't really know what they're doing. I stayed on Frontier's back until they upgraded me to a router which I have full control over. That enables me to tighten security, direct traffic, assign addresses, subnet my internal network and view more detailed logs (handy when I showed them where their problem was). All very handy things. Oh! And I can lock them (ie ISP) out which I also like.
And do you mean "eons"? Or is that mislabeled, too?