Sony laptop PCG-71314L wifi problem when connect to wireless net work

It's seem like when I turn on and connect to the wifi it will work and open website for a couple time then it couldn't open any page website even download music ..etc.. even thought it's mess up the net work I have to reset cable box. The only way net work will work normally that I have to turn off the wifi button from the Sony pcg71314l laptop is there any suggestion ..

Please help me I bought this laptop couple month ago never used it then when I give my old laptop for my cousin and start use this new laptop that when I figure wifi problem but it's too late for me to return the laptop over 30days old