Every time you unplug the pstv AC you will have to resync your DS controller again using the charging wire.
I'm leaving it in sleep mode, hence my confusion. It works the first time I put it in sleep mode, and I can wake it with the controller. Then the next time it just flashes like its not synced to anything and when I wake up the PSTV it doesn't respond.
Its frustrating because I'm playing P4G and I'm in the middle of a dungeon. I'm worried about unplugging the usb stick while it's awake in case it fucks with the game. Might just need to go ahead and get a USB hub cos this bug doesn't seem like it has a solution.