Never seen the unexpected reboot and I do ignore the navi lady quite frequently. The mismatch in the voice and visual guidance had been discussed a couple of times on the European forums, the most recent software/map updates there seem to have solved most of them.
Do you have software 0020 or 0040 on your RNS-E and what version is your DVD?
Do you have software 0020 or 0040 on your RNS-E and what version is your DVD?