ASUS Q550LF Keyboard issues

[Burt Macklin, FBI]

Periodically, certain keys on my laptop keyboard don't register. Specifically, left ctrl, left alt, left shift, enter, z, b, space bar, and a few numbers on the number pad. Sometimes, these keys won't work at all, and other times, I have no problem at all. I've tried updating keyboard drivers from ASUS, but this didn't fix my issue.

Has anyone else had this issue, and if so, what can I do about it?

Thanks...