Do bubbles mean the wine is spoiled?

[White Wine Lover]

I have never had this happen before with a Pinot Grigio, but I opened a bottle last night and it tasted like there were small bubbles in it. In fact, after it sat in the glass a few minutes, you could see what looked like tiny carbonation bubbles on the glass. Does this mean it is "bad" and should be thrown out? The cork appeared and smelled fine, and the wine itself tasted OK, except for the "carbonation." It's a 2002 import, "Santi" Pinot Grigio. Any ideas?