Wifi freeze! MBP will freeze entire wireless network on "join network"

This took a quite time to prove. My MacBook Pro on connecting to WiFi or on renewal of IP via wireless will freeze entire LAN (cut off) all other devices! And of course it will not connect it self. I think it would work if a static IP assigned. Now one will say that is the Router. Not likely, tested with 3 routers always same issue. Must say this was not always like this. A few months ago just randomly disconnecting some devices on network but the MBP stayed connected or just needed restart.
For those who are interested in this trouble, and perhaps learn for future references some background info. Entire LAN is about 20 devices, 8 wireless. From Windows PC, Linux box, LAN attached DVD player, printers, 4 Apple devices and 3 Andriods. All work just fine if this MBP is not turned on. I do work with computers quite a bit but never have seen this. that a computer on the DHCP requests will freeze the router! I would like to know if anybody out there ever had the same problem.

Have you contacted your Internet Service Provider? They may have throttling and might be disconnecting you unintentionally when they begin throttling you.

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