Due won't start after power off-on, have to reset

Hi
I met this problem too .
For solving this problem , I increase the time of board's Reset .
I used a 10K resistor and a 100uf capacitor in series and connect common point of them to RESET pin of board. also 1 pin of 10K to 3.3v and minus pin of capacitor to GND

The Problem solved .

Thanks