2010 KIA BORREGO Power Train Problems

I NOW FIND MYSELF DEALING WITH AN ISSUE THAT I NOW KNOW IS A WELL-KNOWN AND DOCUMENTED PROBLEM WITH THE ZF 6-SPEED TRANSMISSION USED IN THIS PARTICULAR V8 MODEL. THIS PAST WEEK, THE TRANSMISSION SHIFTING BECAME ERRATIC, IN PARTICULAR, AND AMONG OTHER ISSUES, HOLDING ON TO 3RD GEAR AND REFUSING TO UP SHIFT OR DOWN SHIFT PROPERLY. THERE WERE A FEW TIMES IN WHICH WHEN ACCELERATING FROM A STAND-STILL ' A STOP LIGHT AND/OR 4-WAY-STOP INTERSECTION, FOR EXAMPLE ' THE VEHICLE WOULD NOT SHIFT UP FROM 1ST GEAR OR WOULD START ON 3RD GEAR AND WOULD NOT DOWN SHIFT DOWN TO 2ND NOR UP SHIFT TO 4TH. BIZARRE AND DANGEROUS TO SAY THE LEAST, AS IT WAS A STOP-AND-GO TRAFFIC SITUATION. ON TWO OTHER OCCASIONS, WHILE DRIVING AT OVER 35 MPH OR SO, THE ENGINE WOULD SHIFT VERY ABRUPTLY FROM 3RD TO 4TH GEAR, AND THEN WOULD DOWN SHIFT BACK...