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Hello

I am new in this forum, and i use arduino a few months.

Recently my arduino duemilanove (328P) has some strange problem, no matter which sketch i upload to the board, when the sketch is running arduino do a random reset every few seconds . when it do a random reset the built-in L LED (which is connected to pin 13) blink.
can it happen because some problem with a bootloader or it's a hardware problem....?

Thanks for ahead
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Massachusetts, USA
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If it happens regardless of what sketch you have loaded it's probably a hardware problem.

Try installing a jumper between the Reset pin and the +5V pin.  That should prevent the hardware reset signal from occurring.  If that prevents the problem there is probably a fault in the reset circuitry.  Use Google to find the schematic.

Check the pull-up resistor that connects Reset to +5v.
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 Bigger Bigger  Smaller Smaller  Reset Reset

In addition to all of the other missing information, there is a troubleshooting step to try:  use an external power supply instead of USB.

It is common for a background process on the host computer to poll serial ports, which will cause a reset.  Cellular Data devices are typically the culprit in that case.
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