Our 2760P has a transient issue that defies all explanation or repair (so far). The problem is that 2 or more keys will stop working. Then they'll start working again, and others will later stop working for a time. This, as you might think, is frustrating and puzzling.
The list of things that I have tried - to no avail - include:
Check for debris under keys
Re-seat keyboard cable
Replace keyboard several times
Recheck for driver issues
Finally, I transplanted the hard drive to an identical system (which had a perfectly functional keyboard) - and the problem recurred. In other words, it migrated with the hard drive.
So I changed back to the second newer Elitebook (with a hard drive swap) which has a newly repaired keyboard. It worked fine - for an hour - and then random letters began choosing not to work - for a while.
The problem thus transfers with the hard drive, but is also intermittent! Ideas?
Maybe some driver issue.
This happened to me too, I have a toshiba satellite e45-b4200.
some buttons (fortunately not the letters) stop working, so I had to push it multiple times until the input goes through.
To me happens so rarely that I cannot test it immediately, if this happens to you more frequently, I suggest to try a Live Linux distribution and see if this happens there too.
I've just installed Windows 10 (had Windows 8.1) and this didn't happened yet, not sure if the issue disappeared or not.