자답 : 윈도우10 핫스팟에 대한 이슈가 있는 듯하여..
FireDAC Restore 이벤트에서 Reconnet 하도록 하여 연결복원해서 처리했습니다.


KHKIM 님이 쓰신 글 :
: 안녕하세요.. 너무 답답한 마음에 문의를 드립니다.
: 델파이(RAD 10.3)로 개발하여 FireDAC으로 Firebird연동한 프로그램을 사용하는 중에
: windows10 에서 핫스팟을 켜게 되면 아래와 같이 오류가 발생되서 문제가 발생되고 있는 상태입니다...
:
: 열심히 구글링을 해도 좀처럼 좋은 방법을 찾기가 어렵네요.
: 혹시 도움을 주실 수 있는 분이 계실까.. 이곳에 써봅니다..
:
: Firebird_v3.0.5 사용중입니다.
: 현재 최신인 Firebird_v3.0.7 버전도 동일하더라구요..
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: --------------------------------------------------------------------------------------------
: KHKIM    Fri Feb 19 11:43:32 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
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: KHKIM    Fri Feb 19 11:43:32 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
:
: KHKIM    Fri Feb 19 11:43:32 2021
:     INET/inet_error: read errno = 10053, aux server host = 127.0.0.1, address = 127.0.0.1/64474
:
:
: KHKIM    Fri Feb 19 11:43:32 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
:
:
: KHKIM    Fri Feb 19 11:43:32 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
:
:
: KHKIM    Fri Feb 19 11:43:33 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
:
: KHKIM    Fri Feb 19 11:43:33 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
:
: KHKIM    Fri Feb 19 11:43:33 2021
:     INET/inet_error: read errno = 10053, aux server host = 127.0.0.1, address = 127.0.0.1/64478
:
:
: KHKIM    Fri Feb 19 11:43:33 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
:
:
: KHKIM    Fri Feb 19 11:43:33 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     INET/inet_error: read errno = 10053, aux server host = 127.0.0.1, address = 127.0.0.1/64463
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     INET/inet_error: send errno = 10054, server host = 127.0.0.1, address = 127.0.0.1/33050
:
:
: KHKIM    Fri Feb 19 11:43:58 2021
:     REMOTE INTERFACE/gds__detach: Unsuccesful detach from database.
:     Uncommitted work may have been lost.
:     Error writing data to the connection.
: --------------------------------------------------------------------------------------------
:
: