SL8082TR AT+WIPBR=6,6,1 command timeout, +CME ERROR: 803

I have a problem with existing product with the SL8082TR modem. After running the command
AT+WIPBR=6,6,1
to store the current GPRS bearer configuration to flash memory as indicated in the AT commands reference, the response of
\r\nOK
is received, but after that there is no response to other commands like
AT+CSQ
I wonder how long it takes this modem to save the configuration in the flash memory. If I knew that, I would delay before trying any more commands. Also, is there any unsolicited result codes for telling when the configuration has been successfully saved that I can enable?

here is the log

[2024-05-02 13:20:13.637] AT+WIPCFG=1
[2024-05-02 13:20:13.637] OK
[2024-05-02 13:20:13.747] AT+WIPBR=1,6
[2024-05-02 13:20:13.763] OK
[2024-05-02 13:20:13.872] AT+WIPBR=6,6,0
[2024-05-02 13:20:13.887] OK
[2024-05-02 13:20:14.094] AT+WIPBR=2,6,11,“metos.at
[2024-05-02 13:20:14.110] OK
[2024-05-02 13:20:14.329] AT+WIPBR=2,6,0,“metos”
[2024-05-02 13:20:14.329] OK
[2024-05-02 13:20:14.548] AT+WIPBR=2,6,1,“metos”
[2024-05-02 13:20:14.548] OK
[2024-05-02 13:20:14.767] AT+WIPBR=6,6,1
[2024-05-02 13:20:14.798] OK
[2024-05-02 13:20:15.197] AT+CSQ
[2024-05-02 13:20:26.352] AT+CEER
[2024-05-02 13:20:32.588] AT+WDSS?
[2024-05-02 13:20:43.835] AT+WIPBR=4,6,0
[2024-05-02 13:20:43.850] +CME ERROR: 803
[2024-05-02 13:20:43.945]
[2024-05-02 13:20:43.945] +CREG: 5
[2024-05-02 13:20:43.945]
[2024-05-02 13:20:43.945] +CREG: 5
[2024-05-02 13:20:43.960] AT+CEER
[2024-05-02 13:20:50.177] AT+WIPBR=5,6
[2024-05-02 13:20:50.193] OK
[2024-05-02 13:20:50.302]
[2024-05-02 13:20:50.302] +CREG: 5
[2024-05-02 13:20:50.302] AT+WIPBR=0,6
[2024-05-02 13:20:50.318] OK
[2024-05-02 13:20:50.412] AT+WIPCFG=0
[2024-05-02 13:20:50.427] OK

you might need to do some testing on continuously sending “AT” to see how long it takes to get back the communication