I previously had TWC for Home Internet, I now have Fios. I'm using the factory Verizon router. My wireless speeds are as advertised, roughly 25/25, but my hard-wired desktop is getting 1.5/1.5.
The IP address on my PC shows the old TWC IP, not the Verizon IP. Logged in to the router settings and didn't see any issues in there.
After doing some research online, I have reset and rebooted the router to no avail. I have run the command prompt of "ipconfig/release" and then "ipconfig/renew", but neither of those work consistently. I have gotten it to work, but the next time I get on, it is back to TWC.
Is there some type of cache of IP addresses that I can purge? Please help

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic