802.1x re authentication problem

Hello,
I have problem with 802.1x authentication on switch ports which are configured in "Multi Session" mode. In Single host mode and Multiple Host mode it works just fine.
The problem is following, when PC  is first connected on switch port it authenticates successfully. After about 1-2 minutes windows 7 NIC notifies that its going to authenticate again, and after couple of minutes NIC status is changed to “Authentication Failed”. On ACS I only see first authentication request which is successful.  If I unplug PC from port and plug it again. It authenticates successfully and then starts again with same problems.
I was doing packet sniffing on PC, and it seems that after pc first authentication completes successful, switch starting to sent EAP Identity/Request packets to host, for that host is sending EAP Identity/Response to switch, but switch don’t continues authentication process and starts again with new EAP Identity/Request packets.
On Windows 7 host Event viewer I see  following log messages:
                Reason: 0x70004
                Reason Text: The network stopped answering authentication requests
                Error Code: 0x0
The ACS version is 5.3. Authentication method is PEAP.  Supplicant OS is Windows 7 I also trued with Windows XP, with same result. The Authentication switch is ESW 520 with latest firmware. I also trued with 2960/3560 switches and it works perfectly. On ESW 520 switch if port mode is other  than “Multi Session" if works without any issue.
Do you have any Idea how can i fix this ?

Hi ngtransge,
Thanks for rating the replies. You need to select "User Authentication". I am pasting some screenshots which might help you out.

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