This morning I noticed that the "w" key is not responding like the other keys on my MBP. I can get it to work, but I have to press much harder, and it's noticeably more stiff than other keys. I've done some research and I see that this isn't uncommon. Just wondering if others have had the same problem and what they did to fix it. I use this machine for work every day and cannot afford to be without it for several days, so dropping it at an Apple store is not a good option. Thanks.