Yamaha Tyros 2 Arranger Workstation

[NLIS5828]

Hey all, I have two Yamaha Tyros 2's. I've been playing them for about 4 years now, and love them. One glitch I have noticed, is that once the backup registration memory is full, the keyboard will actually skip beats on certain styles when you're playing, really threw me off the first time I heard it, but then i tooled arund with it and noticed when i delete some of my older nonused song settings, it returns to operating perfectly. I was just wondering if anyone has had the same problem, to confirm my suspition. Thanks, Noah