Some minor downshifting in mine recently. Colder weather has had this effect before in mine. I expect it to happen now. First time it did it, shocked me. I read the threads, know about the fixes, so far its normal for me and my car. Not super bad, nothing throwing me or the car around, runs like that until it does warm up. Cold is cold for some of us. AND it is cold here.
IF mine gets worse more pronounced in anyway, then I will change out the intake/ext. cam sensors. I too have not heard or read about the TCM or other things resulting in hard down shift. Does not do it on mine, so far. My car takes a bit of time to warm up, then she is all go. Tire temps, brake pads, transmission, coolant, power steering... you in the cabin, until the heat gets working right, IF you are in colder weather sections of the country. Even if your not in the cold, go easy first few miles before you cut loose. I do, that's just me. In cold weather driving, everything takes time to heat up, even you. No racing at Summit Point this past holiday. Turkey Bowl canceled because of icy conditions. I knew that...
I let my car warm up until it's not warmed up. The hard shift down to 1st or 2nd is very minor for me now. I know about it, have experienced it before in winter, or on hill decent. Still the same since I bought it. No worse no better. Right now I can deal with it as it. You may not have that same thought with your car. Object are closer in the mirror than they appear... ever car is a little different than it's sister or brother out there. This one does hard shifts, this one not so much, this one not at all. This car has been fixed, still downshifts hard. This one has been fixed, no hard shifting ever again.
You can fix it, the dealer can fix it, IF it needs fixing here? Truck transmission in our cars. Bargin basement parts bins for us, cheap... not every thing has MB quality to it, know what I mean.. it is a Saturn after all. IF the TCM or BCM needs to be checked over by the dealer, ok then, they too like us owners know this IS a problem with our cars. There is history here.. with this issue of hard downshifts with the Kappa.