I opened a bottle of Charles Heidsieck Brut Reserve on New Year's Eve. It was 5 or so years old, but we have kept it in our wine fridge, so storage should not have been a huge issue. It was non-vintage. When we poured it into our glasses, there was almost no fizz. There were a few bubbles but they were minimal. The champagne itself tasted like champagne, but it was odd without the bubbles. Any explanations? Did we wait too long to open the bottle? But then if that were the case, would the wine tasted off as well? Thanks for your consideration!