rabbitmq error operation basic.publish caused a channel exception not_found: no exchange

Issue

Rabbitmq is generating many message as following in log file

=ERROR REPORT==== 22-Jan-2019::11:49:45 ===
Channel error on connection <0.4958.1> (10.57.120.167:50304 -> 10.57.120.169:5672, vhost: '/', user: 'guest'), channel 1:
operation basic.publish caused a channel exception not_found: "no exchange 'reply_4344f7c9afa8405bb8d366e34dd037ad' in vhost '/'"

=ERROR REPORT==== 22-Jan-2019::11:49:45 ===
Channel error on connection <0.1576.1> (10.57.120.168:34212 -> 10.57.120.169:5672, vhost: '/', user: 'guest'), channel 1:
operation basic.publish caused a channel exception not_found: "no exchange 'reply_4344f7c9afa8405bb8d366e34dd037ad' in vhost '/'"

Also, some service have error in log like following for nova-conductor

/var/log/nova/nova-conductor.log:2019-01-21 14:08:28.527 510172 ERROR oslo.messaging._drivers.impl_rabbit [req-18a0b68d-6393-45a8-aa9e-39cf83ce4492 eaa6b9fc11979782eb22776aae8b265c818ca672a8a5837bdff287dff970cd7b 20e9c9d2cae9404698891657f9a74cde - - -] [7531af48-2595-44d2-acfc-529e2a1050b8] AMQP server on X.X.X.X:5672 is unreachable: timed out. Trying again in 1 seconds. Client port: 37080
/var/log/nova/nova-conductor.log:2019-01-21 14:08:29.539 510172 INFO oslo.messaging._drivers.impl_rabbit [req-18a0b68d-6393-45a8-aa9e-39cf83ce4492 eaa6b9fc11979782eb22776aae8b265c818ca672a8a5837bdff287dff970cd7b 20e9c9d2cae9404698891657f9a74cde - - -] [7531af48-2595-44d2-acfc-529e2a1050b8] Reconnected to AMQP server on X.X.X.X:5672 via [amqp] clientwith port 59600.