While the EXACT cause is not known, medical researchers at Vanderbilt University speculate that Al's Descronificator Drive has suffered oxidation damage by being subjected to the warm, moist atmosphere during his increasingly frequent and lengthy "cranial-anal inversions."
Not to worry: Here you'll find an excerpt of Al's vital message during an earlier presentation with a little bonus from Hillary at the end of this short clip:
http://www.youtube.com/watch?v=3_qeWnS7Eig