The web.airdroid.com only connect a device in other network at a 1:00 AM until 8:00 AM since 13/10/2015. It's not a local problem because there several users reporting the same problem. During the day not connect. And it seem that most of this users are from Brazil like me. maybe it helps.Phone and PC are connected to different network? Wi-Fi or mobile network? And we're looking into this issue now. Pls kindly stay tuned.