Time out connection coming from rabbitmq While creating channel in rails passenger server

hi i am running my rails application in passenger server with rabbitmq conncetinon class (singleton it initialize every time it is is called)

class RabbitmqConnect 

attr_accessor : connection

include Singleton 

def initialize

credentials = {:host => "localhost", :port => "5126", :user => user1, :password => "sam1", :heartbeat => :server,  :automatically_recover => true, :network_recovery_interval => 4, :recover_from_connection_close => true, :logger => Rails.logger,:threaded => true}

conn = Bunny.new(credentials)

conn.start

Rails.logger.info "Connected to rabbitmq with credentials: " + 
credentials.inspect

@connection = conn

rescue Bunny::Exception => e

Rails.logger.error "Couldn't connect to rabbitmq with credentials: " + credentials.inspect

Rails.logger.error "Exception: #{e.inspect} #{e.backtrace}"

     rescue Exception => e

 Rails.logger.error "Exception durng rabbitmq connection: #{e.inspect} #{e.backtrace}"

end

end

return @connection

 end

end

but when ever i am trying creating channel after starting my server

channel = RabbitmqConnect.instance.conns.create_channel 

i am getting an exception:

Transaction queueing failed with params: {:driver_id=>9972545773, :rating=>"2"}  
Exception: #<Timeout::Error: execution expired> 
["/Users/pourush/.rvm/gems/ruby-2.1.2/gems/bunny-1.6.3/lib/bunny/concurrent/continuation_queue.rb:25:in pop'", 
"/Users/pourush/.rvm/gems/ruby-2.1.2/gems/bunny-1.6.3/lib/bunny/concurrent/continuation_queue.rb:25:in `block in poll'", 
"/Users/pourush/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/timeout.rb:91:in `block in timeout'", 
"/Users/pourush/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/timeout.rb:101:in `call'", 
"/Users/pourush/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/timeout.rb:101:in `timeout'",

But the worst part is that if i change any thing (add a space anwhere in any file and save the file, that's all) in the application after this exception and then again fire any event then i dont get this exception This code is working fine for WEBrick and thin servers plesae help me out to resolve this problem in passenger server