Error on Dell PS4000 Model : 70-0120

Dear Dell Tech Support,

After a week after install Dell/EQL PS4000 and map to Dell PowerEdge R710 server, it's work fine until last weekend it's show below error approx 5-6 times / hour :

Level: ERROR
Time: 11/7/2554, 18:06:18
Member: member2
Subsystem: MgmtExec
Event ID: 7.4.3
iSCSI login to target '10.0.2.11:3260, iqn.2001-05.com.equallogic:0-8a0906-e9cbfc509-d2751dece6f4e094-accesslog' from initiator
'10.0.2.98:34425, iqn.1993-08.org.debian:01:c449db804b10' failed for the following reason:
Initiator disconnected from target during login.

Please suggest us how to solve this issue.

Best Regards,
Jumpol T.