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AAA leads to lack of memory on 3750 E

Hello experts!

I've got interesting issue on my 3750 E stack:

When enable AAA on device everything working good for a while. After some time I could not connect to vty by ssh. When connected to console I found that on device were to many aaa sessions and users:

show aaa sessions

Total sessions since last reload: 27

Session Id: 60

   Unique Id: 1112245

   User Name: *not available*

   IP Address:

   Idle Time: 0

   CT Call Handle: 0      

show aaa user all

Unique id 1112017 is currently in use.

    Unique id 1112017 is freed while doing show aaa user.

Debg: No data available

Radi: No data available


  TTY Num = -1

  Stop Received = 0

  Byte/Packet Counts till Call Start:

    Start Bytes In = 0             Start Bytes Out = 0

    Start Paks  In = 0             Start Paks  Out = 0

  Byte/Packet Counts till Service Up:

    Pre Bytes In = 0             Pre Bytes Out = 0

    Pre Paks  In = 0             Pre Paks  Out = 0

  Cumulative Byte/Packet Counts :

    Bytes In = 0             Bytes Out = 0

    Paks  In = 0             Paks  Out = 0

  StartTime = 09:57:05 PRM Dec 5 2013

Authen: no data

Kerb: No data available

Meth: No data available

Preauth: No Preauth data.

General: No General data.

PerU: No data available

Service Profile: No Service Profile data.

Almost all memory was occupied by Auth Manager .

I reload the stack and was able to connect to it via ssh. But after some time situation happen again.

When AAA is disabled users and sessions are not appears. And memory is ok

I tried to solve this problem by changing IOS, but result was the same.

Now I have:

15.0(1)SE3            C3750E-UNIVERSALK9-M

I will be glad to any advice.

thanks in advance

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