Reopening TCP server on the same port, TCP proxy (Serial LTE modem)

Dear Nordic company,

                                   I am writting to you in order to discuse some trouble with TCP server that I am trying run on Serial LTE modem application.

I am able to create TCP server (after entering APN usign AT+CGDCONT command, AT+CEREG=5 and AT+CFUN=1) with AT#XTCPSVR command.

If i close server with command

AT#XTCPSVR=0,XYZW 
OK
I am not able to open server on the same port again.
AT#XTCPSVR=1,XYZW 

ERROR

But if I try open server on another port, it works.

AT#XTCPSVR=1,XYZK 
OK
I try to logg isue and i know  I am not able to use listen() function.
I tried to fix it with using AT+CFUN=0 and AT+CFUN=1, but this doesn't help me. I tried to shut down net_if via net_if library, it doesn't work. Only way how fix it is use reset. I tried AT%XFACTORYRESET command, but it doesn't help too.
Could you please help me find way how to reopen server on the same port without reset of nrf9151?

Kind regards

Jaroslav Havel