Subaru Repair: Clutch sticking, clutch master cylinder, subaru outback

Question
I have a 1998 Subaru Outback Wagon with 91,000 miles on it.  I replaced the clutch in December 2006 (about 4 months ago) For about the past week, the clutch has been fine on the morning drive to work, but in the afternoon (heavier, more stop and go traffic) the clutch has been sticking to the floor and sometime I actually have to lift it back up with my foot.  The car is driving okay.  1st gear is a little awkward, but I don't know if it is because the clutch feels weird to me and it very well could be me.  The clutch also has to be pushed farther in when it does this sticking thing to be engaged.  What do you think?  

Answer
There is a clutch hydrolic update from Subaru.This includes a new slave cylinder,line and sealing rings it may also require a new updated clutch master cylinder.You can try back flushing it to try and remove any air from the system but it will probably be short lived.Also if you are trying this yourself the hydrolic system is best bled in reverse.From bleeder to master with a pheonix type bleeder.Hope that helps