Multicolor Outdoor String Lights - only 1 of 2 strands works

Started by Nanoo-nanoo-Shazbot!

Nanoo-nanoo-Shazbot!

Bought a kit from Amazon, came with two strands. I synced the controller while one strand was connected, and everything worked fine, but after connecting the second strand and powering back on, the whole kit is non-responsive. If I disconnect the second strand, then the system works fine. Factory Reset and/or reboot/resync doesn't help. Do I have to sync each strand? I'm so confused.