{{Quickfixn}} Missed heartbeat response

[xmoon 2000]

Hi,

 Any idea how/why QuickFIX/N missed sending a heartbeat reply.

Below is from my FIX log. As you can see the heartbeat/response was
normal until 13:34:03.

My engine did NOT send a response, but DID send an order 20 secs
later. The seqnum shows no attempt to send response was made:

20190827-13:32:43.716 :
8=FIX.4.2^A9=0082^A35=0^A49=TARGETID^A56=SENDERID^A57=SENDERIDfix^A34=2512^A52=20190827-13:32:43.717^A10=113^A
20190827-13:32:43.737 :
8=FIX.4.2^A9=82^A35=0^A34=2368^A49=SENDERID^A50=SENDERIDfix^A52=20190827-13:32:43.727^A56=TARGETID^A10=020^A
20190827-13:33:03.717 :
8=FIX.4.2^A9=0082^A35=0^A49=TARGETID^A56=SENDERID^A57=SENDERIDfix^A34=2513^A52=20190827-13:33:03.717^A10=111^A
20190827-13:33:03.741 :
8=FIX.4.2^A9=82^A35=0^A34=2369^A49=SENDERID^A50=SENDERIDfix^A52=20190827-13:33:03.730^A56=TARGETID^A10=012^A
20190827-13:33:23.717 :
8=FIX.4.2^A9=0082^A35=0^A49=TARGETID^A56=SENDERID^A57=SENDERIDfix^A34=2514^A52=20190827-13:33:23.717^A10=114^A
20190827-13:33:24.737 :
8=FIX.4.2^A9=82^A35=0^A34=2370^A49=SENDERID^A50=SENDERIDfix^A52=20190827-13:33:24.727^A56=TARGETID^A10=013^A
20190827-13:33:43.716 :
8=FIX.4.2^A9=0082^A35=0^A49=TARGETID^A56=SENDERID^A57=SENDERIDfix^A34=2515^A52=20190827-13:33:43.717^A10=117^A
20190827-13:33:44.737 :
8=FIX.4.2^A9=82^A35=0^A34=2371^A49=SENDERID^A50=SENDERIDfix^A52=20190827-13:33:44.727^A56=TARGETID^A10=016^A

20190827-13:34:03.717 :
8=FIX.4.2^A9=0082^A35=0^A49=TARGETID^A56=SENDERID^A57=SENDERIDfix^A34=2516^A52=20190827-13:34:03.717^A10=115^A

20190827-13:34:25.904 :
8=FIX.4.2^A9=209^A35=D^A34=2372^A49=SENDERID^A50=SENDERIDfix^A52=20190827-13:34:25.904^A56=TARGETID^A11=S-L:QuiS!7579.AGG-190827T002012000600^A21=1^A38=10^A40=2^A44=1.22966^A54=1^A55=GBP/USD^A59=3^A60=20190827-13:34:25.904^A10=157^A