Node JS + MySQL +ETIMEDOUT issue

I am getting below error from mysql while doing select query.

[Error: read ETIMEDOUT] code: 'ETIMEDOUT', errno: 'ETIMEDOUT', syscall: 'read', fatal: true }

I have active mysql connection.

THere is no problem in that.But I am getting below error. It is happening occasionally.So I am not able to figure out. Experts can help me out this. There is enough number of maximum connection.