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2001 Hyundai Elantra A/T....All maintenance kept up on time and running fine until the transmission cooler line blew in radiator on Wednesday. Had it replaced, coolant flush & refill, transmission fluid refilled, transmission checked for leaks (none).  Car ran fine out of mechanics shop. Now, everytime car is started it jerks into 2nd/3rd gears when tying to get up to between 3-40 mph (2-3xRPM).
BUT, THIS ONL HAPPENS FOR THE FIRST 10-15 MINUTES AFTER THE CAR IS TURNED ON. After that it shifts very smoothly.  Question: What could this be? Had electrical diagnostic run-all is fine. Two shops say orings/seals are going & who knows what else they'll find once trans is opened up.
Would be very thankful if you could point me in the right direction...Thanks.  

do a pan inspection. if the pan is clean, you may have a control valve body issue. if there is material in the pan, you know it is overhaul time.  
ASE/ATRA MASTERS REC/EXP, OEM, ATC AUTO DEGREE