Scratch

My students are currently working on a group game design project. They are nearing the end and just have one more class next week to wrap everything up. Yesterday, I noticed that the file we were using was having saving issues. I would save the project and then have to wait anywhere from 30 mins to an hour for it to finish saving. At other times it saves changes in seconds like it normally does.

Is the file possible corrupted or is there something else here at work like memory issues or exceeding the file size Scratch can easy handle. It's currently about 7.5 mb. As I write this I'm actually surprised at the suddent size increase so I think that may be it but I'll post htis just in case there's something else at work others already know of. Especially since at certain times it still saves fast.