Do you still lose a few frames accuracy when doing this as it was on syncing the HVX200s? I have never tried it with my 170 as none of my friends also have a 170.
Yes, you can lose a couple of frames of sync when you toggle back and forth between camera and MCR mode. The 170 (and the firmware update for the 200) fixed the loss of frame sync when turning the power off, but the toggle between modes still costs a frame or two of sync.