Following up - I popped off a few keys around the "M" key, since I noticed once in a while the "L" key would do the same thing. I used my air compressor to clean out any dirt/dust, and placed the keys back on the keyboard.
So far, after using it for a couple hours, it's been just fine. Tautlih may have been right about just having a little dust in the keys. I'll post another update if it comes back, but so far, so good!