Recently, there are intermittent times when the clutch pedal doesn't spring all the way back; it doesn't happen constantly. The fluid in the reservoir is full. Could this be a slave cylinder issue?

 

Yeah, I've experienced the "sticking clutch" as well. I had my OEM clutch replaced around 75,000 miles, shortly after I bought the car and it has been happening from time to time. It seems to be more prominent if it's a little cooler outside or if the car has been sitting for a long while (like overnight or longer).

I'm not sure though, it's pretty schizophrenic!

Anyone with more knowledge?

 

I changed the fluid and bled the clutch, hasn't happened since then.