Master of Wine Jasper Morris, author of "Inside Burgundy" (2010), says that in his opinion the two most plausible explanations are faulty corks and global warming.

WSJ: Will Lyons on Wine: Burgundy Looks Beyond the Mystery of Premox

Mr. Morris, who is also the author of "Inside Burgundy" (2010), has assembled an impressive-looking team, including four Masters of Wine, the wine trade's highest qualification, and two master sommeliers.

WSJ: Will Lyons on Wine: The Battle of the Brains | Oxford & Cambridge University Blind Wine-Tasting Competition