Reset arduino with SIM800H

Hello,

I am working with the SIM800H module (gprsbee) with my arduino board. I would like to reset the arduino board with the RI pin of SIM800H but I have a problem.

To connect the RI to the arduino I am using a capacitor and resistor in serie. My problem is this:

I put the SIM800H in sleep mode(AT+CSCLK=1) and I wait some time in the loop. Then the arduino sends data via gprs, but some times, this reset the Arduino.

This happens when I put down the DTR signal (pin DTR SIM800H) to wake up the radio.

Any solution tu reset the arduino board with RI pin?

Thanks,

Regards.