I'm having a very hard time trying to narrow this down, but I think it happens if the theme has a .sbs. Unfortunately, it seems to happen randomly which makes it tough to reproduce. Other times, it won't hang until after the device is unplugged, in which case the screen either turns fully white or shows a repeated image. Rarely, it causes a data abort.
SPECS:
Sansa e260R
4GB internal memory + 16 GB microSD card
Rockbox 3.11.2
I think it may be memory related, since sometimes upon successful (and unsuccessful) connects various graphics on the screen are progressively replaced by tutti-frutti colors and black lines.
Is this happening to anyone else?
http://www.sendspace.com/file/dso6zwHere is the theme I'm using (A modified HOLO-like to show the Album title in WPS) but I've noticed it also happens in iPodosha 1.4. Because of that, the next parallel between them might be the presence of a Now Playing spot on the bottom showing the song title.