I am still trying to diagnose the issue with the Verizon FIOS Quantum router. There are latency spikes every 10-15 seconds where the router refuses to route anything. After some research, it appears it may be due to a memory leak in the OS or a NAT table that is too small.
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It is super annoying because it causes latency spikes for the Pushshift API where a simple request will hang for 2-4 seconds. I tried rebooting the router, etc. -- it looks like a firmware issue so far.
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Can always try OpenWRT on the old router if you think it's a firmware issue.
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Is the WAN from the optical network terminal (ONT) connected to the router via ethernet? Or coax? If ethernet, you could easily swap the provided router with a higher quality router, eg a ubiquiti edgerouter
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If coax, you could set the verizon router to bridge mode and let another router do the work. Then you could have more control over NAT table and tcp/udp NAT timeouts