Take it into Kia.

My OH's had a similar clutch problem, it turned out to be a known oil leak issue dripping and getting into the clutch due to a bad seal. They fixed the leak and replaced the clutch under warranty.

When the bought the Focus TDCi late 2005 all was well but after about 9 months the clutch would judder first thing in the morning when pulling off the drive and then when pulling out of the street (if we had to stop), after that no issues until the next morning. Reported it to the garage who reported no other car had been seen with similar issues but with no slip and it changing gear fine they felt they could not justify stripping it down, possibly at my expense. So we agreed that they would not it should it get worse out of warranty (think it was very limited on clutches but the DMF was not considered a wearing part).

Drove the car for the next 12 years and it carried on doing exactly the same but it was only in the winter months and then only on damp/wet days. Still had the original clutch/flywheel when it was sold with over 120,000 miles on the clock.

Really pleased I did not spend money on it, must have been a condensation thing I guess.