I opened 2 different wines over the weekend and both had a terrible bitter aftertaste to them that has not always been there. One of them was a WE vintners harvest Gewurztraminer that was bottled back in May. And the other was a WE Selection Liebfraumilch that was bottled this past December. It has been about 2 months that I tasted the Gewurtz. and tasted good then and only 2 weeks for the Lieb. and that tasted fine then. The color is still good in the wine and there is not any sediment in the bottles. My wine cellar stays a constant 55 degrees and humidity right around 75%. What could have happened?To me both of these wines are undrinkable, They are very bitter tasting and they don't have that smooth off-dry taste they once had.