Wine was delicious with a pronounced mineral thread. Aircon room was good advice, thanks.Agreed.
Keep it in the shade, but not in the fridge; that stunned sense you from a good white that has spent too long in the fridge is only a part of the problem, as the wine will also lack taste. And ice cubes in white wine - a good, classic white wine as a Puligny Montrachet is - are an offence against nature and good taste.
If you have access to a room with air/con, that might be a good place to store the wine between topping up glasses.
Enjoy the wine, anyway.