Sorry for the vague subject title....Im hoping someone with a bit of knowledge can advise me with this

Bascially I have had to hard wire everyone in my office via ethernet cable...everyone is using macs.

So from the router I go into a gigabit switch that has ethernet cables going into each of the mac laptops! Its using DHCP to connect

The problem is that it works great for a bit but then stops working!

Any ideas?!

If it works for a bit then stops working!

Check whether the router's DoS Defense is turned on, that might be getting triggered by some traffic. DoS Defense is under the Firewall menu then DoS defense. If it's enabled, try setting it to disabled and see if it keeps working

Isn't that a little unsafe!?