I never know when the text file will jump back. I am using only regular batteries after my bookport died and had to be sent in and repaired. I know of no adverse effects of static electricity. Actually it has not happened today and unlike another lis member it does not happen to a greater degree or at all with MP3 files. However, I have noticed one interesting thing. If I have to reset the bookport and go to say the MP3 directory if I am listening to something it goes to the next file, not the one I was specifically reading. I have taken special note of this, since it seems strange that it does not go to the exact file, but the one next to it. I will wait to send this till I read the rest of the posts, just in case. I don't think the jumping back has to do with how full the memory card is. When it stops it just stops and I have to hit reset or in rare cases take the battery out for just a second, just long enough to reset it but not so long that I have to reset date and time. Kurt