Previously I was able to fix this issue by upgrading the Proxmox, But now in latest version 3 of Proxmox I have the same issue again,
Any help from Proxmox team?
pveversion -v
proxmox-ve-2.6.32: 3.1-109 (running kernel: 2.6.32-23-pve)
pve-manager: 3.1-3 (running version: 3.1-3/dc0e9b0e)...