iTunes Match Playlists

Does anyone know if there is a limit of songs that can be added to Match playlists? I'm trying to categories lots of songs into about 15 playlists (100's of songs per playlist) and i keep running into 2 issues:

1. I get disconnected from the cloud, which never happens any other time. Then, I can't connect again for at least a few minutes.

2. It frequently only remembers the first few additions to playlists. I'll sort the songs for awhile, then I get disconnecting, then it doesn't remember the last 15-20 songs that were added.

Any ideas? Am I just overloading it with songs? When I first started adding songs to the playlists, it never happened and now it happens after just a few songs.