So I make sweet tea all the time and have for years. I use Red Diamond and put two cups of sugar in a gallon. It has always been great but over the last few months within just a few days of it being in my fridge it will pour out and be thicker. It will also have a funny smell and taste. I don’t understand what the issue is. I used to make two gallons at a time and it could sit in there for a long time and wouldn’t do this. I don’t understand it. Anyone have any idea what it could be?