There was a time when Subway was the go-to sandwich chain in the United States, as stores were popping up everywhere, and you couldn't get the Five-Dollar Footlong jingle out of your head. However, times have changed, and Subway has really started to struggle, with stores disappearing as quickly as they appeared. There are obviously a lot of factors at play here, but it's clear that they need to make some changes to get back on top of the sandwich world. From the lack of fresh ingredients to the difficulties at the corporate level, let's take a look at the real reason why Subway is disappearing across the country.