Hi, The auto-switch doesn't always work. I have a few ideas: I believe it might be because of the processor workload? It often happens when the media player is open and/or while music is playing. My e-mail refreshes automatically and sometimes the N900 will be connected to Internet in 2.5G instead of 3G. My N900 has no devels installed, so I don't understand what this could stem from. Thanks.