Definitely a Power issue. The Ray stuff is very voltage sensitive. I had a similar issue when my system was connected to the boats main electrical panel. Turning over the motor would just draw too much and the ray system would drop out. I ended up installing a new fuse panel with over sized power cables straight to the battery switch. As for the time and date, the raymarine site has all the manuals for download.....I would start there.
Update: just checked the manual. There is a note on page 34 that says the time and date are updated through the GPS automatically.
https://flir.app.box.com/s/gxtzo5bn5...3/3358757758/1