Cannot send long (concantenated SMS) with EG25-G

Hi! We have an issue where the Mulritech L4G1 modem will stop responding and encounter error when we send long SMS (concantenated).

The modem information: Quectel EG25 Revision: EG25GGBR07A08M2G, MODEM-IMEI: 860195052143028

Happen on all L4G1 modems.

Can you advise?

The modem simply does not respond to any AT command after sending a few messages. We are using Linux kernel 4.19.134

Please assist

Hello Jswong,
You can use AT+QCMGS send Concatenated Messages, the specific reference method is shown in the picture below, thank you.