Are you able to get your hands on a USB WiFi adapter to see if that also has the same problems?
It might also be worth checking to see how the Laptop behaves if you connect it to the router with an ethernet cable and disable WiFi.
This thread is now locked and can not be replied to.
Best Black Friday deals 2015 live blog: When is Black Friday & what are the best tech Black Friday…
1995-2015: How technology has changed the world in 20 years
This is the animated Christmas ad everyone's tallking about
The 84 best Mac games: Brilliant RPGs, shooting games, adventure games and puzzlers for Mac OS X