I recently bought a Dell 15 5000, But there is something wrong with the Wi-Fi, all the other devices on my network get speeds of 20+ Mbps, but this computer (just this one) gets horrible speeds of about 2 Mbps... This is only on wireless, ethernet is fine (and this isn't a question of range either, I get the same speed when I stand directly next to the router). 

I contacted Microsoft support and looked around the web for some help, but I couldn't find anything that fixed my issue. The Wi-Fi card that I have in the Dell is a Qualcomm QCA9377. When I googled this card specifically, There were forum posts about people who had the same issue with their computers.

I tried updating the drivers, disabled it, enabled it, but it still doesn't do anything. So what can I do to fix this?