In my testing, I found out what was going on with the copy/move stopping.
When not powered/charging off something (AC Charger, USB Power Pack, etc), the drive wants to go into Standby Mode with the Wi-Fi, if nothing is connected. If the unit doesn’t have anything connected to it (Wi-Fi)(Smartphones don’t count - see below), the unit will go into standby, stopping the copy/move and leaving the LED flashing that the drive is copying/moving from SD Card. If the unit is brought out of standby using short power button press, the copy will resume.
So, if you need to copy/move a SD Card onto the unit, for now, have it either plugged into something and/or have something connected to it, via Wi-Fi. Smartphones don’t count because when they power off into their power save mode, they disconnect Wi-Fi.
I’m working around the issue 1) keeping it plugged into something or 2) keeping something connected to it(Wi-Fi). WD is aware of the problems because I have taked with them. Hoping for a quick fix soon.
Enjoy!