I also have had problems with the PS3 player dating back around 2 weeks now. The player on PS3 tends to freeze up all together, freezing the PS3 along with it and forcing me to shut off the console manually, after which point it goes through a disk check. No other apps do this on the machine and even streaming video from my video services play without issue or interruption. I suspect the latest version of the app for PS3 has some memory leak issues that should be reported to development team, but I also have other, older issues, that haven't been fixed as the app has periodically gone through updates.
Here's a list of problems I've had in order of how long I've had them:
1) The ever present sign-in problem. This one isn't related to memory and seems to result from the player somehow instead losing contact with the PSN authentication server. I'll be logged into PSN, go to use the app, and it will tell me it can't contact the playstation network, try again later. If I first log out of PSN manually, go back to the app and start again, the problem is resolved, only to recur later.
2) The app is very inconsistent about loading album art, sometimes doing so only after a long delay, sometimes never doing so.
3) Recently, the app has begun having problems iterating through my playlists. When I navigate to the "Your Music" tab and select the "More" option to expand the group containing my playlists, I will be able to tick through the first five or so and the cursor will refuse to go further. It properly loads all of the playlists on the screen, but the cursor will treat them as though they aren't there. I've tried backing out to the main screen, then re-navigating to the playlists folder and the problem persists unless and until I restart the app.
4) I've noticed the software has this same tendency, only capturing a limited selection of a larger group of objects to iterate through, when playing from a large playlist on shuffle. Admittedly, some of my larger playlists have hundreds of songs, but if shuffle play is selected, the software apparently builds a list of only 20-25 songs, mostly selected from the first 50 songs or so on the playlist, and will stop after that, or repeat the same list if the repeat option is selected.
5) The most recent problem to emerge, and the one which has at times rendered the app completely unusable, is that it will freeze the playstation 3 or 4 songs into a playlist, necessitating a hard reset of the whole machine. This will occur regardless of load on my local network, how long the machine has been on, and independent of any other factors I can identify. I have even gone so far as to delete the app and re-download and install it and the problem remains.
I'd like it very much if that last problem could be looked into, while the others are more minor gripes.