I experienced a new odd behavior since 1.6 update. When I connect DR to my computer when it is sleeping (I guess this is previous zZz mode? anyway, I mean the state where I can still read displayed text), so that it wakes up by the connection, after I reply to the dialog box which says 'do you want to connect to the computer', often DR freezes. This does not always happen but happens very often so is quite reproducible.
However this isn't really big deal because now I learn to wake the DR first by touching any button and then connect to the computer.