freeradius 2.0.5 problem

[Egi]

Hello!

I have a problem with my freeradius server.
The schema is the following...

Mikrotik Router > freeradius server > Mysql Server

 From time to time (Maybe once in 4-5 days) i get this error repeated 
for many many times:

Thu Jul  3 17:39:33 2008 : Error: Discarding duplicate request from 
client private-network port 35005 - ID: 223 due to unfinished request 
5713664
Thu Jul  3 17:39:35 2008 : Error: Discarding duplicate request from 
client private-network port 35005 - ID: 223 due to unfinished request 
5713664
Thu Jul  3 17:39:57 2008 : Error: Discarding duplicate request from 
client private-network port 45713 - ID: 65 due to unfinished request 5714017
Thu Jul  3 17:39:57 2008 : Error: Discarding duplicate request from 
client private-network port 35070 - ID: 126 due to unfinished request 
5714018
Thu Jul  3 17:39:59 2008 : Error: Discarding duplicate request from 
client private-network port 45713 - ID: 65 due to unfinished request 5714017
Thu Jul  3 17:39:59 2008 : Error: Discarding duplicate request from 
client private-network port 35070 - ID: 126 due to unfinished request 
5714018

also followed by some less errors like this one:

Thu Jul  3 17:41:45 2008 : Error: WARNING: Unresponsive child (id 
1377945920) for request 5715136, in module exec component post-auth

And then many other errors like:

hu Jul  3 17:43:16 2008 : Error: Received conflicting packet from client 
private-network port 35977 - ID: 249 due to unfinished request 5718311.  
Giving up on old request.
Thu Jul  3 17:43:16 2008 : Error: Received conflicting packet from 
client private-network port 35976 - ID: 248 due to unfinished request 
5718310.  Giving up on old request.
Thu Jul  3 17:43:16 2008 : Error: Received conflicting packet from 
client private-network port 35978 - ID: 250 due to unfinished request 
5718312.  Giving up on old request.
Thu Jul  3 17:43:16 2008 : Error: Received conflicting packet from 
client private-network port 46742 - ID: 247 due to unfinished request 
5718313.  Giving up on old request.
Thu Jul  3 17:43:16 2008 : Error: Received conflicting packet from 
client private-network port 46729 - ID: 235 due to unfinished request 
5718317.  Giving up on old request.

also mixed with  some other:

Thu Jul  3 17:42:58 2008 : Error: WARNING: Unresponsive child (id 
1346476352) for request 5716367, in module exec component post-auth



And after that freeradius becomes unresponsive, i get "Radius timeout" 
on microtik and so the clients aren't authenticating.
I have around 1200 clients in total, usually there are 700-800 users online.


Thank You!