Mine started doign the same thing a few days ago.
First lost reverse. ECU reset by dealer then all was well.
Drove another week and half, but occaisonally wnet into limp mode at 120km and most of the time on downhills when gearing down. I suspected the trailer pulling the car back when it braked iitself. Uphills didn't occur
On way hom last week I found that sometimes the D took a whiel to engange, like you said above, rev until 1500 or so then it jumped away and all was well
Drove via Cradock on the N9 towards Colesberg and 15km from there the At/Temp light came on....Pulled over car off. The read the manual car on and idles for about 15 min.
Light went off and drove on another 4 km, light back on. Same story idled for a while and it went off. Pulled off and the car shuddered struggled to idle , short jumps forward and I turned off the engine. Called Marius for some advice
Called a tow truck and got driven to Bloemfontein on the back of a lowbed and trailer attached. 4 hours later arrived in Bloem at Mitsubishi at 18:30. Took car in for diagnosis the next day
We stayed over and they did soem tests in the morning. MUT and also levels and oil quality was checked.
Oil good but MUT noted 4 errors related to slipping etc.
Next step to open the box but their technician is goign on leave for 2 weeks.
Called Freek form Mitspro, said he will tow us home and take her in and this was doen on Saturday.
Awaitign the news from Mitspro on the state of what is wrong.

Anyway she is in good hands.