Hello I'am quite new to this Arduino world. So I just got my A.uno R3 up and running and I am trying a small program found here : http://arduino.cc/en/Tutorial/Array I reduced the delay variable to 50 ms to increase the speed and added af few delay lines to reduce the dutycycle of the leds. However after each 42 cycles, all leds are turned off for a few seconds and the onboard led no.13 does some flashing. After this it resumes correct program execution for another 42 cycles - and so on. This happens when powering through the computer usb as well as powering with a usb charger, so I guess it is not computer communication that interrupts the Arduino. Also tx and rx leds are off at all times, not indicating any communication.
What is happening ? Is it bad programming ? Is there some buffer in the Arduino that needs to be reset ? I would assume and hope that what ever program the Arduino is executing it should be able to go on for ever or at least more than 42 cycles before showing errors.
Thank you very much for your help and for an incredible forum in general. Best Regards. Jacob