I can recreate this repeatedly on two devices (8310 running 4.5.0.69, 8120 running 4.5.0.52 {I know, not the newest versions})...
If anyone could confirm (similar devices running other versions, or disparate devices running similar versions, or a combination of both) it would be appreciated.
Media > Music > (play any song)
while playing: Media > Menu > Explore > (open any text file) Menu > Page View
This has generated a full reboot on both my devices...
I'm not looking for a fix...
Just posting a bug report...
cheers!
Myk