Macbook air 2011-mid keyboard keys Q W E R T Y U I O working sporadically I have an issue where only QWERTYUIO keys are working sporadically or just not working. I have to press them a lot of times to start working and they work for a while and stop again. I have tried reseting PRAM and SMC but with no luck. When I use the Keyboard viewer they keys are not even being registered when I press them. 

Kind Regards
Had the same problem on my MBP13 mid 2012. After 2 months of research and almost spending $600 to replace the top case I found this video:

https://www.youtube.com/watch?v=kh88cn_rtLo

I remove the top case of the key and gave a good clean and they start working again!!!

I know this reply is for an old post but I might help other having the same issue. If this doesn't work, it might be a hardware fault :/