Single Status Update
If anyone is using iSCSI with FreeNAS and are having issues with their drives randomly disconnecting or getting "no ping reply (NOP-Out) after 5 seconds" messages try adding the following under system then tunables...
Variable = kern.cam.ctl.iscsi.ping_timeout
Value = 0
Type = sysctl
Haven't been able to track down a root cause but it's been 8 days and still no issues.