What are they doing? won't accelerate>dealer fix>won't accelerate>

El Zombo

Hi,

100% stock, 2014 MT w/sports package. Every few months the car won't accelerate well. Loaded Kia Sport Ute pulled away from me at a light this morning. I take it to the dealer, they do something they never charge for and the problem goes away for a few months. Whatever it is, it's really minor because they were nice enough to not put it in the vehicle repair record. I'm bringing it in for the 3rd time, maybe 4th since 2014 and this time I've asked for an explanation of what they're doing and options for actual repair.

Has the dealer just been clearing codes or reprogramming something? I have this odd feeling that now the car is out of warranty and the issue is going to require bags of cash.