I’m still bummed the 600 broke and my provider only had 650s, but I figured out what was going on with the 650 and I am liking it better.
The user manual says not to sync to another device of a different type, and boy I should have listened. After doing a hard reset, clearing everything and reinstalling from scratch, I have 10 mb left rather than 1 mb.
I do like the better screen resolution.