You are getting some message about "saving files," right? I think Kismet is unable to keep the power management from rearing its "nanny knows best" head. I find that if I tap the screen frequently, it never does this. I really wish Nokia had provided real, granular power management options on both the N800 and N770. It has kept me from using them in a number of commercial applications. Next to the god-awful email client, the lack of control over basic functions like power management is one of the worst aspects of the Nokia Internet Tablets, imo.