My android device keeps loosing network connection and every time i have to reboot it or manually search for network operator before it can reconnect again.
Lock the phone to 2G only.
This bug is common with network operators who have both 2G and 3G networks operational.
if you phone is set to "Auto" latch onto 2G/3G, it will tend to loose the network sometimes.
You will realize that if you transfer the SIM card to a 2G only phone, the situation will be normal.
once i realized that, i decided to set my phone "network mode" to 2G only and it has been stable ever since:
|Go to Settings|
|Click More ...|
|Go to Mobile Networks|
|Choose 2G only|