Bad keys on Macbook Pro This week the keys hjkl on my (Early 2011) Macbook Pro sort of all stopped working at the same time (and only those keys are affected).  I say "sort of" because they can all start working perfectly again for an extended period of time and then suddenly for no reason they all stop working.  

And then in gets weirder.  If the keys are all dead I can repeatably press just one of the keys and (after varying length of time) it comes good.  At which point the remaining bad keys also start working again.

My initial thought was that it is time to replace the keyboard, but the action of the keys all coming good at the same time confuses me.

So is there an explanation to what is going on?  Or is it time to replace the keyboard?
Try removing the keys and cleaning under with cotton buds, there are some tutorials on how to do this safely - check your keyboard layout and settings in system preferences too.