Image version is related to linux and support files like mjpg_streamer, wlan etc. Of course newer versions also have newer server versions, but you can get them with updating as well. V10 has newer linux updates and also contains some improvements in the image, so a update is not wrong.
The problem why it stopped the print depeneds on why it stopped the print. Did linux disconnect serial port? At least on a pi this is one of the most frequent reasons as it is so sensitive to under voltage. Run e.g. dmesg and search for under voltage warning. See in /var/lib/syslog at the time of disconnect to see if linux was the reason.
