Originally Posted by timlover

Routers get shitty as they get older, heat takes a toll on them. It probably has never had a firmware upgrade on it..which is always a good idea to stay on top of. This is especially true when it comes to the wireless signal is putting out. If you have a new router, make sure its got the latest firmware upgrade as well. Also make sure you that you have one of the latest cable modems with whatever they are providing in your area..DOCSIS 3.0 / DOCSIS 3.1 and make sure the cable modem has its firmware upgrades as well....which is a good reason to own your own instead of leasing one, because cable companies are for shit about keeping their leased modems up to date...

You should also check on what band and channel you are broadcasting on....b/g/n and auto & 1-11 ex. You can download a free wif analyzier for google play or itunes that will show you how many devices you have broadcasting and on what channels. Moving your internet wifi to its own clear channel will help. House phones and other electronic devices operating in the same channel can impact your inwifi if you are having issues with that dropping in and out as well

On the cable company end, it could just be the cable just going in and out and when that happens, of course the modem will grab the new DHCP address before your router...in a perfect world the router should grab the new IP address and then pass it down to the PC....that doesn't always happen. Which is why you have to do power down and up cycles with the modem, router, and PC.

If its happening with a new router, that means its either:

a) Cable modem failing
b) Cable signal dropping from your box to the modem
c) Coax is old and getting shitty...
d) all of the above

It would be a good idea to have replaced all the coax from the main splitter in the house to the cable modem, unless its a dedicated line (which they usually are) and replace your Cat5 cables that run between the modem and routers...believe it or not..those can get shitty over time as well...