I can't press some keys on my acer aspire 4739 laptop. The keys I can't press are: L, K, Y, R, E and W. I haven't checked the numbers or the F# keys. The weird thing is, it starts working after a few hours of pressing things or doing nothing. But it gets really annoying, this is the first time I've got it. I haven't spilt any liquids on it and I really would like to find a solution aside from replacing my keyboard, thanks!