I need help wifi not working

Hello,


My wifi doesn't on my Sony Vaio laptop it connects fine
But it disconnects by it's self. Also I have another one
Same kind and that one works just fine. Another
Thing is that when I use the one the wifi doesn't work
My other laptop and my other stuff that use wifi like
My iPod iPad and cell don't work it logs on but it also
Disconnects but only when I use that one laptop
For the rest of the time I can be on all my devices at
The same time and it's doesn't give a promble just
Only when I use the wifi on that one laptop