Broken pipe error

I have an issue that need your help I am using neo4j with laravel using graphaware driver.
I try to run queries in concurrent jobs but these error appear in log randomly
"errLog":{"status":500,"data":"database-error: fwrite(): send of 87 bytes failed with errno=32 Broken pipe",

I think these due to the use same connection for multiple queries or it may happened due to the connection time out or other reasons ?