I am running into issues with the following setup

ESXi 5.5U1
two VM Kernel ports with round robin configured

I can successfully connect to the ISCSI target on the DSS from VMware. The problem is that after a few minutes the VMs that are on the storage freeze and the only thing that will fix the issue is if I reboot the ESXI host. After the reboot everything works fine for a while but the same thing happens. I called VMware but they said that the issue more than likely is on the storage side.

It would be a great help if anyone could shed some light on the situation.

Thanks..