Packet loss occurs only with over 100 size?

Hi, Has anyone here encountered this issue?

Packet loss occur only with over 150,200 size while pinging with size of 100 work perfectly?

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Heres the simple scenario:

VLAN10,20,30 (RTR1) ----TRUNK-------(PROVIDER)--------(RTR2)VLAN30

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Vlans were assigned in different location, Now only issue is with VLAN 30 spefically, which exclude troubleshooting between RTR1 and the local loop provider. Tshooting should be done between provider and RTR2..

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What would be the issue of this ping zsize?

1. No congestion seen on RTR2
2. running hardcode 100/full
3. no ratelimit
4. cpu normal

Thanks