Acceptor Resetting the connection just after Login

We are using fix acceptor (version 1.6.4). The acceptor resets the connection from initiators many times when logon is received. Can someone please help?

2019-12-01 23:10:00,712 |FIXT.1.1:SENDER->RECEIVER: 8=FIXT.1.1|9=74|35=A|56=SENDER|49=RECEIVER|52=20191201-23:10:00|34=1|108=60|98=0|1137=9|10=045|
2019-12-01 23:10:00,718 |FIXT.1.1:SENDER->RECEIVER: Accepting session FIXT.1.1:SENDER->RECEIVER from /(IP ADDRESS):(PORT)
2019-12-01 23:10:00,723 |FIXT.1.1:SENDER->RECEIVER: Acceptor heartbeat set to 60 seconds
2019-12-01 23:10:00,725 |FIXT.1.1:SENDER->RECEIVER: Setting DefaultApplVerID (1137=9) from Logon
2019-12-01 23:10:00,734 |FIXT.1.1:SENDER->RECEIVER: Refreshing message/state store at logon
2019-12-01 23:10:00,751 |FIXT.1.1:SENDER->RECEIVER: Received logon
2019-12-01 23:10:00,754 |FIXT.1.1:SENDER->RECEIVER: Responding to Logon request
2019-12-01 23:10:00,761 |FIXT.1.1:SENDER->RECEIVER: 8=FIXT.1.1|9=78|35=A|34=1|49=SENDER|52=20191201-23:10:00.761|56=RECEIVER|98=0|108=60|1137=9|10=253|
2019-12-01 23:10:04,859 |FIXT.1.1:SENDER->RECEIVER: Session state is not current; resetting FIXT.1.1:SENDER->RECEIVER
2019-12-01 23:10:04,865 |FIXT.1.1:SENDER->RECEIVER: 8=FIXT.1.1|9=59|35=5|34=2|49=SENDER|52=20191201-23:10:04.865|56=RECEIVER|10=155|
2019-12-01 23:10:04,877 |FIXT.1.1:SENDER->RECEIVER] Disconnecting: Session reset