Memory card troubles

So I'm using 3.52 m33-4 and regardless of if I run games from the ISO folder on the memory card or if I use the UMD itself, anytime a game has to access the memory card it feezes completely and the only thing I can do is hard reset.
Some games I can play all I want, until I need to save, at which point it accesses the memory card and then freezes. Any ideas on a fix?
Thanks in advance for any help.

First of all I would upgrade to the latest firmware (3.90 M33-2)...
Then if it still doesn't work, buy a new memory stick...
Those are just my suggestions, someone else may have a fix...

But definitely regardless of if your memory stick is wrecked or not, upgrade your firmware...