Nokia Lumia 800 - My Lumia gets randomly disconnected from the Wi-Fi network

  1. In Windows Phone 8, tap Settings > Wi-Fi > advanced  > Keep Wi-Fi on when screen times out. Otherwise your Wi-Fi connection closes when the phone screen switches off.
  2. If you are using a home Wi-Fi network, log in to your wireless router, and temporarily change the security options WPA/PSK[TKIP]+WPA2/PSK[AES] (Mixed Mode) to WPA2/PSK[AES] to check if it affects the Wi-Fi connection.
  3. If you have Bluetooth running in the background, this can cause interference with the Wi-Fi network connection. Tap Settings > Bluetooth and switch the status temporarily to Off.
  4. If you are using a public Wi-Fi network, all IP addresses may be in use. Try connecting again later.