HELP - I lose internet connection when Plex Media Server is started

I am new to Plex.
I installed the latest PMS program (1.24.1.4931-1a38e63c6-x86) on one of my W10 (20H2) desktop computers. Whenever PMS is running, I immediately lose the internet connection on the computer but the local network connection remains good. I think it’s doing something to my FIOS router settings (Actiontec MI424WR rev i). I have a small home network with 3 computers, a NAS device, 2 DVD players and a ROKU box. All devices are hardwired with fixed IPv4 addresses. All of my network cables connect to a Netgear GS108 v3 Gigabit switch which is connected to the router. In order to restore my internet connection, I need to stop the PMS program and either change the IP address on that computer or reboot the router. I don’t know if it makes a difference, but I have Serviio Pro 2.0 running on my other 2 computers.
I hope I supplied enough information.
Any help is appreciated.

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