So I made an Irish red (came out good) and siphoned 2 gallons into a secondary to add raspberries to so I could mix it up a bit. 2 weeks pass, I bottle, 3 more weeks pass, and I chill and pop one open.... Tastes like crap and has zero head. I even dumped it down the sink (vigorously) and still didn't get any foaming. The raspberries were from frozen and I heated em in ~150 degree water for a few minutes before putting em in the fermenter. What could be causing this?