After sending TEST REQUEST message, FIXEngine can't be connected

We are using QuickFIX on the Initiator side.
Suddenly, QuickFIX sent TEST REQUEST.
Acceptor returned HEARTBEAT message immediately.
But QuickFIX didn't recognize HEARTBEAT message.
Therefore QuickFIX judged time-out.

After judging time-out, QuickFIX sent LOGON message.
Acceptor returned LOGON message immediately.
But QuickFIX didn't recognize LOGON message again.
Therefore QuickFIX judged time-out.

20170209-00:01:26: Sent test request TEST
20170209-00:02:20: Disconnecting: Timed out waiting for heartbeat
20170209-00:02:21: Initiated logon request
20170209-00:02:32: Disconnecting: Timed out waiting for logon response
20170209-00:02:33: Initiated logon request
20170209-00:02:43: Disconnecting: Timed out waiting for logon response
20170209-00:02:44: Initiated logon request
20170209-00:02:54: Disconnecting: Timed out waiting for logon response
20170209-00:02:55: Initiated logon request
20170209-00:03:05: Disconnecting: Timed out waiting for logon response

Acceptor message log:
2017 Feb 09 09:01:24.041.936 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:01:24.041,34=1195283,...
2017 Feb 09 09:01:24.203.275 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:01:24.203,34=1195284,...
2017 Feb 09 09:01:24.424.520 [FIXSND] 8=FIX.4.4,9=216,35=S,52=20170209-00:01:24.424,34=1195285,...
2017 Feb 09 09:01:25.012.688 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:01:25.012,34=1195286,...
2017 Feb 09 09:01:25.013.568 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:01:25.013,34=1195287,...
2017 Feb 09 09:01:25.109.057 [FIXSND] 8=FIX.4.4,9=216,35=S,52=20170209-00:01:25.108,34=1195288,...
2017 Feb 09 09:01:25.293.963 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:01:25.293,34=1195289,...
2017 Feb 09 09:01:25.525.713 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:01:25.525,34=1195290,...
2017 Feb 09 09:01:26.141.202 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:01:26.141,34=1195291,...
2017 Feb 09 09:01:26.270.703 [FIXRCV] 8=FIX.4.4,9=70,35=1,34=5411,49=...,52=20170209-00:01:26.270,56=...,112=TEST,10=146
2017 Feb 09 09:01:26.270.787 [FIXSND] 8=FIX.4.4,9=73,35=0,52=20170209-00:01:26.270,34=1195292,49=SCI,56=...,112=TEST,10=054
2017 Feb 09 09:01:26.424.711 [FIXSND] 8=FIX.4.4,9=216,35=S,52=20170209-00:01:26.424,34=1195293,...
2017 Feb 09 09:01:26.429.398 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:01:26.429,34=1195294,...
2017 Feb 09 09:01:26.641.169 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:01:26.641,34=1195295,...
2017 Feb 09 09:01:26.994.496 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:01:26.994,34=1195296,...
2017 Feb 09 09:01:26.994.933 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:01:26.994,34=1195297,...
2017 Feb 09 09:01:27.109.910 [FIXSND] 8=FIX.4.4,9=216,35=S,52=20170209-00:01:27.109,34=1195298,...
.
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2017 Feb 09 09:02:18.992.329 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:02:18.992,34=1195523,...
2017 Feb 09 09:02:19.300.151 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:02:19.300,34=1195524,...
2017 Feb 09 09:02:19.310.049 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:02:19.309,34=1195525,...
2017 Feb 09 09:02:19.508.998 [FIXSND] 8=FIX.4.4,9=220,35=S,52=20170209-00:02:19.508,34=1195526,...
2017 Feb 09 09:02:19.720.621 [FIXSND] 8=FIX.4.4,9=216,35=S,52=20170209-00:02:19.720,34=1195527,...
2017 Feb 09 09:02:19.766.977 [FIXSND] 8=FIX.4.4,9=216,35=S,52=20170209-00:02:19.766,34=1195528,...
2017 Feb 09 09:02:19.888.979 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:02:19.888,34=1195529,...
2017 Feb 09 09:02:19.949.890 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:02:19.949,34=1195530,...
2017 Feb 09 09:02:20.050.769 [FIXSND] 8=FIX.4.4,9=218,35=S,52=20170209-00:02:20.050,34=1195531,...
2017 Feb 09 09:02:21.271.969 [FIXRCV] 8=FIX.4.4,9=76,35=A,34=1,49=...,52=20170209-00:02:21.271,56=...,98=0,108=60,141=Y,10=066
2017 Feb 09 09:02:21.312.495 [FIXSND] 8=FIX.4.4,9=76,35=A,52=20170209-00:02:21.312,34=1,49=SCI,56=JBKI-QUOTE01,98=0,108=60,141=Y,1

Initiator message log
8=FIX.4.4^A9=218^A35=S^A52=20170209-00:02:19.309^A34=1195525...
8=FIX.4.4^A9=220^A35=S^A52=20170209-00:02:19.508^A34=1195526...
8=FIX.4.4^A9=216^A35=S^A52=20170209-00:02:19.720^A34=1195527...
8=FIX.4.4^A9=216^A35=S^A52=20170209-00:02:19.766^A34=1195528...
8=FIX.4.4^A9=218^A35=S^A52=20170209-00:02:19.888^A34=1195529...
8=FIX.4.4^A9=218^A35=S^A52=20170209-00:02:19.949^A34=1195530...
8=FIX.4.4^A9=218^A35=S^A52=20170209-00:02:20.050^A34=1195531...
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:02:21.271^A56=...^A98=0^A108=60^A141=Y^A10=066^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:02:21.312^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=062^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:02:33.270^A56=...^A98=0^A108=60^A141=Y^A10=068^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:02:33.283^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=072^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:02:44.270^A56=...^A98=0^A108=60^A141=Y^A10=070^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:02:44.285^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=076^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:02:55.270^A56=...^A98=0^A108=60^A141=Y^A10=072^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:02:55.280^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=073^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:03:06.270^A56=...^A98=0^A108=60^A141=Y^A10=069^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:03:06.285^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=075^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:03:17.270^A56=...^A98=0^A108=60^A141=Y^A10=071^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:03:17.279^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=080^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:03:28.270^A56=...^A98=0^A108=60^A141=Y^A10=073^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:03:28.280^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=074^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:03:39.270^A56=...^A98=0^A108=60^A141=Y^A10=075^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:03:39.304^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=073^A
8=FIX.4.4^A9=76^A35=A^A34=1^A49=...^A52=20170209-00:03:50.270^A56=...^A98=0^A108=60^A141=Y^A10=068^A
8=FIX.4.4^A9=76^A35=A^A52=20170209-00:03:50.282^A34=1^A49=...^A56=...^A98=0^A108=60^A141=Y^A10=071^A

We hava 2 questions.
1.Why did QuickFIX send TEST REQUEST suddenly?
2.Is this problem settled by a newest version?