Exception (504) Reason: channel/connection is not open

[Ngọc Nguyễn Đình]

hi all, some time i get this Error when publishing msg to rabbitmq by https://github.com/streadway/amqp for go application. 
Checking from rabbitmq managerment, I see a large number of new closed and reopened channels during the time I got the error.
I have tried to check the health of two servers running rabbitmq and my application, all of them are in normal condition (cpu, ram,..)
Can you suggest some reasons for this?

[Ngọc Nguyễn Đình]

I have also checked the causes below but they are not happening:

• Redeclaring an existing queue or exchange with non-matching properties will fail with a 406 PRECONDITION_FAILED error
• Accessing a resource the user is not allowed to access will fail with a 403 ACCESS_REFUSED error
• Binding a non-existing queue or a non-existing exchange will fail with a 404 NOT_FOUND error
• Consuming from a queue that does not exist will fail with a 404 NOT_FOUND error
• Publishing to an exchange that does not exist will fail with a 404 NOT_FOUND error
• Accessing an exclusive queue from a connection other than its declaring one will fail with a 405 RESOURCE_LOCKED

[Gabriele Santomaggio]

This client  https://github.com/streadway/amqp  is not maintained anymore. 

Please read: https://github.com/streadway/amqp#beware-of-abandonware 

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Gabriele