I'm having difficult setting up my Deco X55 with Verizon FiOS.  I have the G1100 Gateway router but internet only.  I went into the G110 settings and released the DCHP Lease, turned off the G1100, disconnected the ethernet cable and plugged it into the X55.  Everything was fine for a couple hours, then it lost internet.  Everything is fine on the ONT.

Can I use the X55 as the main router or do I need to put the G1100 into bridge mode? (but that defeats the purpose?).

Thanks