I’m sorry to hear that. Fortunately I have a few ideas as to why that might have happened. Make sure you’re not storing your beans in the top plastic container. While it might be convenient, it causes the beans to become stale faster. Also make sure you use your grounds right after making them. It might save time, but it unfortunately is another way for your coffee to go stale faster than you’d like. Finally, changing the grind setting can greatly change the way your coffee tastes. So, make sure you’re grinding your coffee to a coarseness you like.