B800i dropping off-line when deleting files

I have several B800i’s at customer sites and connected via iSCSI to Windows servers. At two sites I am needing to delete several TB of files (medical images) because they have been migrated to other storage devices. My issue is when deleting more than only a few files at a time, the B800i will drop the connection which I’m guessing is from the iSCSI connection becoming saturated. The only way to restore normalcy is to manually power down the Drobo, disconnect the Ethernet cable, reconnect it and power it up. I’m curious if anybody have any ideas on a way around this, or if there are others who have experienced the same issues. Thanks.