The wifi card in my ASUS X555LN laptop has started to act funny. When I install the latest driver for it, the connection drops frequently, but when I roll back to an older driver the system crashes. Because of all this, I've started looking for a replacement card, but have not found any compatible models (made exactly for my laptop). The question is, can I buy a newer one that also support the ac standard or am I limited to the n standard that my current card supports?