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evb sim508 gsm resetting

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Hi.
I found at my workplace an evaluation board based on GSM module SIM508 EVB V1.01, manufactured by SimCom


What seems to be the problem:

I have inserted a valid SIM card; soon after I activate GSM (by pressing Z1 button ) the GSM_NET led start blinking and then stops after 10-15 seconds. During this seconds ,I receive string "Call Ready", and AT commands seems to work(I am using realterm). After the shutting off of the GSM_NET led , the EVB does not respond to AT commands any more.
I am wondering why it keeps resetting the GSM connection. Power supply is not the problem, because just this led stops lighting.

Does anybody worked with this evb?
 

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