is yr unit pohd2 or mini2 or old models?

may not be the best i can only suggest these 4 u to try:

~ under setup, set auto scan to off, set delete history on
give it time to work, be patient, not power off too fast.

~ if this doesn't work, as a the last resort, reininstall older firmwares.
3699 may work although it's missing a couple of features.
make sure you get the right version for the model.

how much did it cost?
what largest size builtin hdd can it take?
can it access you tube?

thanks!

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Added on November 14, 2012, 12:15 am
hope you reformatted with the player itself, that might help.

too many files in one folder is not good for browsing, i break them into subfolders, each <20 files.

i mean reformatting the hdd with the player, not using pc.
there is an option in the setup menu.
somewhere in this thread, it has been mentioned that formatting hdd with the player itself is recommended, something to do with partitioning, if not mistaken.
also, think it was mentioned some brands of hdd pose starnge problems but not other brands.
discussed long time ago, i can't remember exactly when and where in the thread.

i'm Playon-mini user, my player firmware is r7317 so far never brought me any error issue, previously i'm using r-3966 i hv the same eroor issue that you mention.

Try again reinstall the new firmware refer here: http://www.acryan.com/forums/viewtopic.php?f=175&t=18243

My collection same as you 1 folder 1 movie, some mkv file with srt or aas subtitle and photo.

But my HDD all is WD, how about yours?

Myself install the firmware with pendrive, the pendrive file system was set as fat32 instead NTSC, did you do that?