Do we know why? The specs for the power adapters (5v/1000ma) are the same for the v3 and the v4, and the v3 works fine off the floodlight. I just came out to post the fact that my new v4 locks up within 10 minutes or so of powering up. I dropped it in place of the v3 that was attached to my original floodlight. I guess I have my answer as to why it’s locking up. UGGGHHHHhhhhhh