I'm not savvy enough to know what "bufferbloat" is

JDGamer wrote:

I'm not savvy enough to know what "bufferbloat" is,

If the link speed goes down along the network path, then the switch or router feeding that slower link has to buffer the packets.  If there is too much buffering, you get unnecessary lag.  If not enough, then packets get dropped.  Too much buffering is bufferbloat.

In your case, the gigabit connection between the PS5 and the router is a downlink choke point (bottleneck), since the feed into the router is 2 gbps, but the feed into the PS5 is on only 1 gigabit.  So the router has to buffer (hold) packets until the link can accept them.  There's nothing you can do about that choke point, since both the PS5 and the router LAN port only support gigabit.  Cables, IP settings, etc won't eliminate it.  That said, it's only a problem if the gaming servers try to send you data faster than the PS5 can receive it.

The uplink from the PS5 isn't a bottleneck, since the link from the router to the ONT (and your FiOS service) are faster than the PS5 ethernet.

JDGamer wrote:

I have been having a HORRIBLE time gaming with this router.  

... and still am having network-wide crashes where every device 

Not clear that you are experiencing buffer bloat, since that normally doesn't lead to network crashes, only lag. 

Can you reach the router's web page after the network crashes?  Are you still seeing the WiFi network names in your phone after it crashes?

Is the router still under warranty?