What App and/or music service are you using, is it the Sonos App, another App using Airplay2 or a Bluetooth connection? Is it with every music source, or just one source in particular?
Have you tried the Move setup on a different WiFi channel, or different WiFi band (2.4Ghz/5Ghz)?
Is there any security software, VPN, Firewall, MAC Spoofing, Antivirus software on the controller device that maybe hindering the control/playback of the ‘Move’?
Besides the Fios Router are there any other wireless access points, extenders, repeaters etc?
Also have a read of this earlier community thread:
https://en.community.sonos.com/troubleshooting-228999/sonos-and-verizon-home-internet-6866622