I don't know if this is a stupid idea or not but I know when it rains heavy or they do something in the area to do with the water pipes or when they added fluoride to the water it tasted funny/bad (assuming your on town water). Could it be that something like this may have occurred? You would probably have noticed. Also maybe if you soaked (or injected?) your thawed meal in/with some water. Sorry hopefully someone more experienced can give you some tips.