Refreshing mview is hanging after a database level gather stats

hi guys,
can you please help me identify the root cause of this issue.
the scenario is this:
1. we have a scheduled unix job that will refresh an mview everyday, from tuesday to saturdays.
2. database maintenance being done during weekends (sundays), gathering stats at a database level.
3. the refresh mview unix job apparently is hanging every tuesdays.
4. our workaround is to kill the job, request for a schema gather stats, then re-run the job. and voila, refresh mview will be successful then.
5. and the rest of the weekdays until saturdays, refresh mview is having no problems.
we already identified during testing that the scenario where the refresh mview is failing is when after we are gathering stats in a database level.
during gather stats in a schema level, refresh mview is successful.
can you please help me understand why we are failing refreshing mview after we gather stats in the database level??
we are using oracle 9i
the creation of the mview goes something like below:
create materialized view hanging_mview
build deferred
refresh on demand
query rewrite disabled
appreciate all your help.
thanks a lot in advance.

1. we have a scheduled unix job that will refresh an mview everyday, from tuesday to saturdays.
2. database maintenance being done during weekends (sundays), gathering stats at a database level.
3. the refresh mview unix job apparently is hanging every tuesdays.
4. our workaround is to kill the job, request for a schema gather stats, then re-run the job. and voila, refresh mview will be successful then.
5. and the rest of the weekdays until saturdays, refresh mview is having no problems.
You know Tuesday's MV refresh "hangs".
You don't know why it does not complete.
You desire solution so that it does complete.
You don't really know what is is doing on Tuesdays, but hope automagical solution will be offered here.
The ONLY way I know how to possibly get some clues is SQL_TRACE.
Only after knowing where time is being spent will you have a chance to take corrective action.
The ball is in your court.
Enjoy your mystery!

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