These steps make my week 40 stop playing music and return to the homescreen (the one with the icons) everytime - I'd like to hear if this happens to yours aswell :-
Press Music
Start playing any song
Press the square button at the bottom (returns you to home screen)
Press Safari
Press Bookmark symbol before 'Safari can't connect' pop-up (bookmarks pop up)
Press Edit then select a bookmark - at this point the music stops
The bookmark then appears for editing but if you wait about 2 seconds Safari will exit to the homescreen
Press Music
Start playing any song
Press the square button at the bottom (returns you to home screen)
Press Safari
Press Bookmark symbol before 'Safari can't connect' pop-up (bookmarks pop up)
Press Edit then select a bookmark - at this point the music stops
The bookmark then appears for editing but if you wait about 2 seconds Safari will exit to the homescreen