I am using the Hello World program which something like 8-bit Counter.
The problem is, I found that the LED stop at the middle (ie. restart when counter to ~37)
However, when I add Serial.beign(9600) and start serial monitor the output at the same time.
The counter seems work normally....
I had tested various sample codes and still find the same problem, did I miss something important ?
You have an application running in the background that is probing serial ports. When it opens the Arduino serial port, the board resets. The typical culprit is a mobile phone or PDA application.