more clutch pedal problems

I had the clutch replaced about 3 years ago. The master cylinder and slave cylinder have also been replaced about 18 months ago. Now a couple of times the clutch pedal has stuck down when putting in first gear and pulling away. As all the new components have done less than 5 thousand miles can not see its any of these. Any ideas. Thank You.

i can concentric release brgs and slaves arent the best idea