I don’t know, but starting multiple threads asking the same question worded diffferently is probably not going to get you any more answers than you’ve already got.
I took another look at your original post (on this subject) and noticed you said you have 5200 tracks on the player and card and were attempting to put on more. Later in the thread you claimed you were sucessful in adding more to the 32GB card, and therefore I am assuming you have well over those 5200 songs on it now, is that right?
There is an 8,000 track limit (as was mentioned in that thread also), but that is a loosely-based estimate from the manufacturer. Just like with gas mileage estimate quotes on new cars, one will rarely acheive those lofty goals. In fact, the reality is that many have posted here that they have hit the ceiling at 5,000 tracks or even less. Long track names, deeply-nested folder/file heriarchies, larger-sized embedded album art are some of the things that will affect this count.
Frankly, I think you’ve hit the wall and that’s why you’re having trouble adding additional playlists and everything with this 32GB card where you had no issues with the 16. You’ve just got too many tracks on the player/card combo and the database file on the player is not large enough to contain all of that track data plus the playlists too.