Cannot use some Apps and Web Sites when using Fios.

[AWilmit]

In the last few days I have started having a problem being able to use certain apps/websites when on my Fios 1G network. Mainly I have noticed the problem on hotel and airline apps/sites.  Sometimes I cannot sign on and other times I cannot get to information like account information.  If I use a VPN, everything works fine.  If I use an android phone on Verizon mobile, everything works fine.  Using an iPad and the phone as a hot spot works fine.  If I use my secondary wan (Optimum Online) everything works fine.  I have the same issue with iOS, Android and Windows 1 1 devices and it doesn’t matter if they are connected wirelessly or wired.  When using Fios, some sites and apps seem to be completely or partially  blocked.

I  use an Asus RT-AX88U router.  IPV6 is off on my router.  I am using use DNS 1.1.1.1 and 1.0.0.1. I have rebooted the router and my Verizon ONT.  Until recently, all of hese sites and  apps worked perfectly.