Thanks @Anish S, indeed the oil cooler needs air flow going through it to be able to cool down, so when the car is standing still there won’t be much airflow so that might explain the overheating, although it’s indeed strange during winter time.
Anyways looking at the previous replies so far it would seem that:
1) driving in tiptronic causes less shifting, hence less work to do for the transmission and lower chance for overheating.
2) if the transmission oil is still fine and there is no obstruction in the transmission cooler, a fan might be an extra help especially during longer standstill periods.
I have the impression the overheating sign is more sensitive on the recent Pajeros which makes me think maybe something was changed (different sensor, lower alarm level trigger)...
Let’s keep gathering more information the coming weeks and especially towards the summer.