hmmm.......sorry to read your day got wrecked up ......
Well, I suppose that it's possible some water got on the clutch disk and caused to slip. Not likely though.
Are you "hard on" the clutch .... ??
Steam from under the hood after going through high water could be just that hot stuff got wet and is drying off.
Maybe IF the clutch disk got wet, it may have smoked itself a bit trying to dry off ....
I reckon the dealer will sort it out.
Please keep us posted.
humfrz