? Sediment in White Wine

[White Wine Lover]

I was recently given a case of NYS white wine I particularly like from a Hudson Valley winery, 2002 vintage. It has been appropriately stored in a wine cooling unit around 60 degrees. I just noticed, when taking a bottle out to chill more in the refrigerator, that there is noticeable sediment of some kind floating around in the bottle. This is not secondary fermentation, I know what that looks like. It looks like solid particles. I checked the rest of the bottles, and 5 of them have this. Does anyone know what this could be? The winery is quite a distance from me, but before I call them to ask, I wanted to check with the board.

Thank you!
WWL