PSP won't save

I've been playing FIFA10 for several weeks and built my player career upto level 10. I had saved a profile and anytime I loaded the game (UMD), said profile would 'open' and I could continue to save progress etc.

The problem is that since a couple of days, it won't save anything & each time I load the game it asks me if I want to autosave (I click yes) and it takes me to 'build a new career' and won't recognise any loaded profiles (it says there isn't any to load). I don't understand why this is happening as I see some data saved in the 'saved data utility' (or whatever it is called). But it can't seem to locate / find / open this. The other message I get is to ensure I have about 3000Kb available (but I have 7000+ available on my memory stick). Besides, I've tried with other games and it saves progress for these other games but not FIFA10. I am at a complete loss as to why it is doing this with my FIFA game… not to mention terribly frustrating to always have to start at level 1 and no possibility to save progress at all.

Please help!

I tried again yesterday, creating 2 careers and saving them (visible as saved data in the 'data utility') and when i switch off and back on again, it says nothing is saved, so cannot load anything... :(

Kilobytes...? Okay, what sort of memory stick are we talking here?

I know with my PSP 3000, Street Fighter Alpha 3 Max can't autosave, and I have to manually load the files because it was created to work only with a 4 GB max memory stick (before transferring the data, I had a 2 GB stick). So, your problem could be it's too massive of a memory stick for the game to recognize. However, this problem is very unlikely, due to how it's a 2010 game.

Your best bet is still to get a new USB cable for the system and reformat the memory stick after backing up the files on your computer, as previously stated.