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AST-driven IP Server Process Problem?

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The Question is:

I have written tcp/ip server using system routines (sys$qio etc) in FORTRAN.
Server can accept 16 simultaneous connections.
All I/O(s) is done at AST level.
My clients in Window2000 and request some data
from server every 5 seconds. Data length is about 400 bytes.
After 2 or 3 hours laters, VAX side sockets look like as follows
UCX> sh dev bg585/full
 Device_socket: bg585                        LOCAL               REMOTE
                              Port:           5500                 1051
          Type: STREAM        Host:     CAL21     
                                                           RECEIVE       SEND
                                   Queued I/O                    0             0
       Q0LEN         0             Socket buffer bytes           0         60019
       QLEN          0             Socket buffer quota       16000         60000
       QLIMIT        0             Total buffer alloc            0         68712
       TIMEO         0             Total buffer limit        64000        240000
       ERROR         0             Buffer or I/O waits        5610             0
       OOBMARK       0             Buffer or I/O drops           0             0
                                   I/O completed              5609          5611
                                   Bytes transferred         56090       1572393
  Options:  REUSEADR
  RCV Buff: WAIT
  SND Buff: None
When "Socket buffer bytes" begins to increase,
no data send to a client. Even a observed the
network with a network analyzor, no packets coming from server but client is
 able to continue sending. Eventually server side gets in SUSPENDED mode.
Please note that I have enough "small buffers" and "large buffers" free.
What else parameter I should set and from where?
Thanks in advance.
Please urgent !

The Answer is :

  Please contact the Compaq Customer Support Center, as the details of
  the TCP/IP Services version and ECO level installed on the system as
  well as details of the application source code will be required here.

answer written or last revised on ( 9-OCT-2001 )

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