The "sleep mode" and/or "battery saving" apps may cause connection problems, since they cut off the WiFi connection when the smart phone is idle. To ensure the TrackView connectivity at any time, you could make your phone always on by turning off the sleep mode:
Go to Settings -> Wi-Fi
Find Advanced options and click on it
On the Advanced Wi-Fi configuration page, click on "Keep Wi-Fi on during sleep" and choose "Always"