Hardwired- No Router: Windows 10 and MAC Big Sur freezes and/or drops Skype and Zoom

Maybe I have posted in the wrong section of the forum?..... I'm new to this.  So sorry that I could not meet this commentor's personal high-faluting standards of communication.   For anybody else that is interested in helping rather than criticising, here are more details..

1. I have a radio signal ethernet signal from a nearby mountaintop
> tower, with internet ready cable coming into the house.

   That tells me approximately nothing about your ISP, the equipment at
your house, or its capabilities.  I also don't know what "ethernet
signal" means.  (Does an FM radio staion broadcast a "loudspeaker
signal"?)

    --->A tower broadcasts a radio signal to our house, which has a dish to 

    receive the signal.... the cable from the dish brings the internet connection

    our home, with an RJ45 connector, so that I can plug it into my laptop

     directly, or use switches, without a modem or router.  I can use a router

     if I want, but prefer to be hardwired.

> 3. We do not use a router or wifi: ethernet cable comes into home
> ready to connect, and I am hardwired for everything via Netgear
> Switches.

   "ready to connect" to _what_?  Does this service come with any
instructions?

         ---> Ready to connect to a laptop, switch, or router.  I use switches

              primarily.

   "We do not use a router"?  Perhaps you should.  Perhaps you do.  I'm
not familiar with any residential Internet service which allows a
customer to connect an unlimited number of devices to the public
Internet.  What are the IP addresses of your various computers?

      ---> Our ISP allows us to connect to the internet via their broadcast tower.

       I have tested the system with and without a router.  no improvement

       with a router, and I prefer not to use wifi, but I have also tested using wifi.

> [...] (I've tested using wifi with no improvement, [...]

   How, exactly, without a router?

          ---> from dish, via CAT 5or6 cable, into house, into computer directly with

          RJ45 jack, and/or  into Netgear switches, then by CAT 7 cable in our house

          to various rooms, where I have installed wall jacks, and then plug my laptop

          into these wall jacks.

> [...] I've tested direct connected to the cable that comes into the
> house from our roof).

   I know approximately nothing about what's on your roof.

      --->. The ISP's dish receives the signal from a tower, and brings that

          into our house.  No router needed.  I connect to other rooms via 3

         Netgear Switches.

   You seem to be describing (very vaguely) a network which contains no
Netgear equipment.  Why come here?  Why not ask your (unspecified) ISP?

     --->.  I have asked my ISP.... they will be coming to recheck things.  I 

     am trying to determine what if any issues could cause freezing or dropping

    of Skpye and Zoom, even though Speed Tests are generally good.

> [...] no big change when the ISP changed their equipent setup [...]

   With my weak psychic powers, I know approximately nothing about your
old ISP equipment or your new ISP equipment.