voice memos do not consistently sync to itunes.

I have voice memos on my phone, dating back to 2010. In Itunes, I have "sync voice memos" checked, and it transfers songs randomly. I only have about a dozen memos on my computer, when there are about 100 on my phone. I've noticed that none of the memos that I have not renamed, and are labeled "unamed recording" never sync, but even the ones i do rename sometimes don't sync as well. Super frustrating.

ios8.0

Maverick