network stops working for 2 mins when laptop joins network

Hi. We have a working home network with 4 pcs connected to the network. 3 via ethernet and 1 via wireless. Everything is working fine. Then we have 2 more laptops which are connecting via wireless. When either of those 2 laptops joins the network, the whole network stops working for a minute or 2. After that it starts working again for everybody (including those 2 laptops). However its super annoying when it does that all the time. (The laptop goes into sleep mode, when u turn it back on again the internet(and the whole network) stops working for awhile again..).
Any ideas why it does that for those 2 laptops?
All the pcs in the network have static IPs so there is no conflict.
All the drivers are up to date.

Let me know if you want/need any more specific data/info.
Thanks