we´re using an Arduino Mega 2560 board with Ethernet Shield and external 12V DC power supply. After turning on the power, the uploaded sketch works just fine and does what it´s supposed to. After an undefined time (sometimes just 1 minute, sometimes about 30 minutes) the programm seems to get stuck. The strange thing is, that the "on" LED on both, the Arduino Mega board and the Ethernet shield starts blinking (at a rate of about 0,5 Hz). I haven´t found any information yet, what the blinking means.
Does anyone have an idea?
Thanks in advance.