Upgraded to Gigabit, still connecting at previous 50/50 speed

I recently upgraded my service from the 50/50 package to Gigabit.  When I use the Quantum gateway I am able to get the faster speeds but I am very unhappy with the router.  It seems to drop connection every few minutes and does not play nice with my VPN.  I decided to use my previous router (ASUS RT-N12D1).  I released the DHCP license on the Quantum and connected my ASUS .  The connection establishes fine, but it is still at my previous 50/50 speeds.  Am I missing something that needs to be done on my side?  Or is there something Verizon needs to change in my account?  Any help would be greatly appreciated.