SIMCOM 7600E +CIPSEND Replies Error

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    Russell

    Hi there

    Using the SIMCOM 7600E device to connect back to a server via TCP.

    it will connect and hold its connection fine, I am asking it ti report back its CSQ and cell information.
    The CIPSEND:0,1,1 is a single byte back to my server (for the purpose of ascertaining if the connection is still live via a web gui and notification)
    .
    It runs fine until some time between hour 0 and hour 50 or running the +CIPSEND:0,1,1 command to the modem returns RX : ERROR as below,
    The output below is me communicating with the modem, The modems output stops responding entirely when views via its USB comm port. Has anyone experienced this before?

    852726 RX: +CIPSEND: 0,1,1
    856291 RX: +CEREG: 5,2ABF,390600,7
    862694 T+CIPSEND=0,

    862710 RX: >
    862726
    862742 RX: OK
    862758 RX: +CIPSEND: 0,1,1
    872726 T+CIPSEND=0,

    872742 RX: >
    872758
    872774 RX: OK
    872790 RX: +CIPSEND: 0,1,1
    882758 T+CIPSEND=0,

    882774 RX: >
    882790
    882807 RX: OK
    882823 RX: +CIPSEND: 0,1,1
    892790 T+CIPSEND=0,

    892807 RX: >
    892823
    892839 RX: OK
    892855 RX: +CIPSEND: 0,1,1
    902823 T+CIPSEND=0,

    902839 RX: >
    902855
    902871 RX: OK
    902887 RX: +CIPSEND: 0,

    73267749
    3267749 ESC
    73267765 RX: >
    73267781 RX: ERROR
    73269749 T+CIPSEND=0,

    73299749
    3299749 ESC
    73299765 RX: >
    73299781 RX: ERROR
    73301749 T+CIPSEND=0,

    73331749
    3331749 ESC
    73331765 RX: >
    73331781 RX: ERROR
    73333749 T+CIPSEND=0,

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