SIM868 AT+CIPSEND problem

hi
I’m using sim868 to provide tcp connection after i connect to server and send 10 data by AT+CIPSEND command the next at+cipsend command not working and times out and i have to terminate the connection by AT+CIPSHUT and then connect to server again after 10 sending data by AT+CIPSEND command there will be no response from module and the command becomes time out .i used two other same module but they had this problem too i didn’t had this problem on sim800 module.is there any specific setting on sim868 for send data?
Thank you.

They both use exact same commands. May be the module is not getting enough energy to transmit data.