2000 Subaru Forester clutch problem

Just got a new clutch and fly wheel. Within 24 hours the clutch was sticking to the floor and I had to use my toe to get it back up. My repair guy came to pick up the car today and said it was working fine now, but he did take it into the shop. (Believe me if it was working fine I would not have been using my rusting, no AC 1990 Integra all sweltering weekend.) Can a clutch work and then not work, or is it miraculously curing itself???