Notes keep disappearing on my iPhone 4?

I've never had this problem until recently. But every time I use the Notes app, my note will disappear in a few days. This is SUPER annoying because I keep up with my work schedule using notes. Is anybody else having this problem? How do I fix it?

The answer that I have succumbed to is to download Evernote and give up on Notes. Even an Apple tech at the Apple store in Spokane WA could not fix this.