Rollback segment problem

Hello:
I'm using oracle 8 database and I have a process that generates small transactions (and they're really small), usually this process is executed from 2 or 3 different workstations at the same time, but they don't use the same data sets. The frequency of execution of the small transaction is 10 or 12 a second for each workstation. Each time the process is executed I can count near 6000 transactions, and I always have 2 o 3 of them arising "ORA-01562: failed to extend rollback segment number n" error. Since the transaction uses a small space of the rollback segment I can't find an explanation to this behavior. Is this related to the time between transaction and the freeing of the unused rollback segment ? I would really appreciate if somebody could help me!!!
Thanks in advance, Javier Petrozzi

It appears to me that some of the transactions remain open for quite some time and the new transactions are not able to obtain an extent for the rollback segment.
The following query gives some useful information.
  1  select s.sid, s.username, r.name "SEGMENT NAME"
  2  from v$session s, v$transaction t, v$rollname r
  3  where s.taddr=t.addr
  4* and  t.xidusn = r.usn
SQL> /
       SID USERNAME                       SEGMENT NAME
        16 SCOTT                            _SYSSMU7$You may have to commit your changes sooner.

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