WiFly shield + Arduino + auto-connect issue

Question

I'm using the WiFly shield with Arduino, and everything works fine: I upload my skecth to Arduino via USB, I connect a 9V battery, I disconnect the USB, and the wifi module transmits everything fine (it transmits data to my web server).

When the battery runs out I replace with another battery, but then the wifi/arduino no longer communicates with my server..

I'm a newbie on Arduino and I don't understand whether if every time the power is off Arduino loses the program, or simply that the wifi is not able to auto-connect...

Is this a software problem or hardware? And if software what am I doing wrong?

This is my sketch example - I'm just sending a string to my server:

#include "WiFly.h"
#include "Credentials.h" // includes ny user:pass wifi network

Client client("[***myserverip***]", 80);

void setup() {      
  Serial.begin(9600);

  WiFly.begin();

  if (!WiFly.join(ssid, passphrase)) {
    Serial.println("Association failed.");
    while (1) {
      // Hang on failure.
    }
  }  

  connectServer();
}

void loop() {
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  } 

  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    delay(60000); // check every minute
    connectServer();
  }
}

void connectServer() {  
  Serial.println("connecting...");

  if (client.connect()) {
    Serial.println("connected");
    String query = "GET /arduino/test?q=testString  HTTP/1.0";

    client.println(query);
    client.println();
  } else {
    Serial.println("connection failed");
  }
}

So everything works fine but when I unplug the power and plug it back the arduino doesnt restart the process.

Answer 1

I found the solution myself - the problem was with the hardware.

The problem was in my Arduino UNO R2, there is a known bug.

I bought a UNO R3 and I don't have this problem anymore.