Mjdavis1994

So I recently purchased an 07 Scion TC with 100k miles, manual tranny, no rust or weird noises. This problem I've been having has been getting on my nerves being that I've been a mechanic for a few years now and can't figure it out. The clutch is sticking but not as if the master cylinder is failing or it's losing hydraulic pressure. It's getting stuck after the clutch fully disinguages (roughly an inch and a half away from the start position). There is no correlation in the temp of the vehicle and the sticking. It's random but is happening more and more often. I looked at a diagram of the clutch pedal layout for my tC and it looks as though there is a spring that possibly pulls the pedal up the rest of the way maybe after the hydraulics have disinguaged the clutch. Am I correct on that? Maybe the spring is faulty? However that wouldn't explain why it is spuratic I wouldn't think. I thought about a pedal adjustment but I don't want to bandage the problem I want to fix it. Any insight on this would be greatly appreciated.