Syslog out plugin connection error and UDP drops

We have 4 logstash servers currently just taking ~4000/sec. Works fine almost all the time, but few times couple server have UDP drops.
At the same time, i see following exception logged.

syslog tcp output exception: closing, reconnecting and resending event {:host=>"", :port=>514, :exception=>#<SystemCallError: Unknown error (SystemCallError) - No message available>

Trying to find, if the syslog tcp output exception is making the packets to pile up and cause UDP drops or is it other way around?

Logstash config
4 servers - 4CPU,8 GB
workers = >8
queue_size => 50000
pipeline.workers => 8
batch_size => 2000

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