Made a Merlot in a 6 gallon carboy. Used bentonite for hot stability during fermentation. Racked. Then chilled it for 20 days in 20 to 30 deg F for cold stability. After using Superclear for fining racked again and aged an additonal 6 months in the carboy and finally filtered with a 1 micron mechanical filter. Bottled the wine in September to make room for a new batch. Two weeks later I noticed a light flakey precipitate. The wine tastes great. The precip settles quickly and is easy to remove during decanting. The wine is still clear. Any ideas on what happened?