Υou get this RTL Trap Error Number: 6E5D8015, every time you unplug the usb cable from the computer.
I tried this with Vista and Win7 (both with Mass Storage and MTP Auto Detect).
After I've done a "safely remove hardware" or "Εject", 3490 is still on power from the computer.
I mark the time, I unplug the usb cable and 3490 turns off.
I check the "error time" and it's the exact second I unpluged the cable and power went off.

Finally I've managed to shut it off while still plugged in the computer (Win7, Mass Storage).
I got the same as before, one more RTL Trap.

It has something to do with power turning off after you disconnect 3490 from the computer.

3490 firmware 6.30 (3760 modded).