High Latency Pings in Local VLAN Gateway

Hi, I have an EX3300 network with QFX5100 at core switch and i am experiencing slow ping times when pinging the default gateway (10.107.14.1) from user end (say 10.107.14.145).
Ping times are greater than 15ms is typical.

This is from a client to the gateway.
Reply from 10.107.14.1: bytes=32 time=25ms TTL=64
Reply from 10.107.14.1: bytes=32 time=30ms TTL=64
Reply from 10.107.14.1: bytes=32 time=18ms TTL=64
Reply from 10.107.14.1: bytes=32 time=45ms TTL=64
Reply from 10.107.14.1: bytes=32 time=17ms TTL=64
Reply from 10.107.14.1: bytes=32 time=21ms TTL=64


The topology is that VLAN Gateway is on QFX5100 and ping is being send from end user system connected to EX3300.


What makes it weirder is when I do a ping to any other system in the VLAN (say 10.107.14.30), it consistently gives me =1ms/=2ms which is what it should be.

This is from a client to one of the other IP in VLAN.
Reply from 10.107.14.30: bytes=32 time=1ms TTL=64
Reply from 10.107.14.30: bytes=32 time=2ms TTL=64
Reply from 10.107.14.30: bytes=32 time=2ms TTL=64
Reply from 10.107.14.30: bytes=32 time=2ms TTL=64
Reply from 10.107.14.30: bytes=32 time=1ms TTL=64
Reply from 10.107.14.30: bytes=32 time=2ms TTL=64


How can I improve the default gateway ping response? Any help is greatly appreciate.