Looks like it is case-sensitive, try this one: http://wiki.maemo.org/Flopswap
It happens after some (hours) idle time or heavy use (modest/email, 5 microb, opera, leafpad, file man, yappari, all at the same duration). I took some months recently to build a completely new image taking care to keep as little as possible daemons, widgets n pluggins loaded (scaned thru every postinst file and files dumped into /etc/event.d/). Yet to install KP, overclock, etc for specific reasons... Looked at speed patch n swap management too (I implemented my own). The phone app or BT plugins would still take some seconds to load or swap in still. I figured the best way would be if I could keep only those apps/modules permanently loaded n not swapped out.