notebook-router conflict

hello,

i've just bought an dell vostro 5470, everithing goes ok, it's a super notebook, but after 30 minutes my wi fi connection crashed. i thought that was something wrong with the internet provider , i called and it wasn't. i reconfigured the router, it worked and again it crashed. I alsohave  an assus notebook, and 3 smartphones, they all work just fine if the vostro laptop is shut down. when i turn it on they all loose connection. is there a conflict between dell vostro and the router?