Kracken, just check the guaranty. In many cases, it's 24 months./

Anyway, I follow this thread since beginning - like, I suppose, many other people do - but, unfortunately, I can't help. I've never heard about such a problem on N900. At last resort, You could try restoring backup from state where it worked (via backupmenu, stock bakcuping utility wont do and it's just a waste of time), or re-flashing completely. Usualy I don't recommend this, but your problem seems hardware'ish - would be good to filter out possible software issued, before proceeding with hardware.