Thanks for that sir

You need a switch, not a router. (You might need a router too.) A
switch does the processing a lot faster.

How does your network operate? Do the computers connect to each other
to share files or do they just connect to the Internet.
For mostly file sharing, a managed switch would help. I would recommend
2 switches with a gigabit uplink between them. I am not sure how much a
difference layer 2 switches would make as opposed to just managed
switches.

If all the machines mostly connect to the Internet, then you need a
router capable of that many connections (but you don't need a router
with that many ports.) It would be helpful (essential?) that you have a
gigabit connection between the switch and the router.

Randy R

All machines share files and connect to the internet. The LAN is fine.
Its the internet that keeps disconnecting. And it affects all computers
at the same time.
I think your advice about the gigabit connection between the switch and
the router is very good. I will look into that. Thanks