+QIURC: "closed",: Module EC200U disconnects itself automatically

Steps for config:
“AT+QICSGP=1,1,"xx.xxx.xx","","",0\r\n”
“AT+QIOPEN=1,0,"TCP","xxx.xxx.xxx.xxx",xxxx,0,1\r\n”
AT+QISEND=0,0\r\n

Payload sends+Ctrl+Z

after some time Module disconnects its connection,
–>QIURC: “closed”

I want to send continuous data to the server.
Is there anything wrong in configs?
Why Module disconnects?

Thank you!

This event is usually caused by a network interruption (network link failure or link duration limitation, etc.) or the server actively disconnects the TCP connection. You can use another server or another carrier’s SIM card for cross-verification
Cross validation server:
https://netlab.luatos.com/

Sure I will try with another server,
Thank you.