Steve has a DOCSIS 3.1 modem and wants to know if there's anything faster. Leo says that DOCSIS 3.1 can handle up to 1GB down and DOCSIS 3.2 is coming. Should it run hot? Leo says no. If it's too hot to touch, that's a problem and could indicate the modem may be wearing out faster. But cable modems don't wear out as fast as your router does, so you may need a new router. But the main reason to update a router is to get a more secure system. Most consumer routers don't get updated and have unpatched vulnerabilities.
Look for a router that will offer automatic firmware updates.