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SIM808 Reset Automatically!

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Sharagim

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Hi,
I have a SIM808 with 4V-2A power supply (Revision:1308B02SIM808M32).
Sometimes on SMS delete it reset automatically.
Is there any idea why this is happening ?
 

Hi,
I have some new updates about the issue.
Most of the time which this problem happening is when I turn on the board after some hours and If the board can work for about 5-10 minutes then the problem wont happen any more.
 

This mostly happens when the internal resistance of the power supply is too high and the SIM808 tries to connect to the GSM network. Try a real LiIon or LiPo battery attached - this might solve the issue.
 

I have a similar problem, i changed the power supply, change the DC/DC converter, but the problem still there, sometimes the module restarts i dont understand why, maybe you have more expertise in what should i check in my circuit, in order to solve the restart problem.
Thanks by your help
 

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