L322 2006 automatic gearbox thumps down gear when cold

HI, iv'e had this problem for a while now. When i leave the car over night to cool down fully, i go out in it in the morning and for the first mile or so it thumps down from 3rd to 2nd {quite aggressive) and then not so bad from 2nd to 1st just as you are about to stop. Iv'e had the gearbox reconditioned along with valve body and ecu. All adaptations have been reset, fitted a reconditioned transfer box, changed all the front arms and ball joints. When the car has warmed up it drives 100% with no issues at all. Any help would be great fully appreciated.

ps, if i put it in sport mode it still does it but it's alot better.

Yeah mate, they all doos that.

PS, Thanks for the intro, now if you wouldn't mind asking in the Range Rover section as the toffs in there don't venture out here that often.

Welcome to the forum