I recently purchased a new Clip ZIP after suffering the headphone jack failing on my previous (I’ve seen this seems to be a somewhat common problem, and the responses that these things have to be babied caused me to be hesitant, but I like the form factor) at just after the expiration of the warranty period.
Both are 4GB models, and both use firmware 01.01.21A. My music is contained on a 32GB microSD card.
The new Clip Zip will freeze with some files, requiring me to hold down the power button 20 seconds to shut it down. It then resumes at some point several songs previous to the one on which it froze. The old, broken, Zip has no problem with these same files on the same microSD card.