Hello guys, I had the same issue. Every time after I shut down the sound bar for a longer period of time or after the bar goes to sleep, the subwoofer won't reconnect unless I power cycle it.
I already did the firmware update according to the video instruction. USB drive was in FAT32 format. After entering the serial #, there was only one update, Version: v83a (S/N: 106655719110001 - 106655719242000). The update process looked smooth. However, this doesn't really help. I still have to do the plug/unplug thing.
Did the firmware update actually solved this issue for you guys?