Error Processing Wait activities!

Hi:
We are repeatedly facing severe problems in production while processing deferred activities (Wait states and java functions in the workflow).
When the background engine runs, it is still able to process some of the queued activities, but most activities still remain in the queue.
By stepping through the background engine code, I found that for some activities the dequeue event times out, and for some activities, activity validity check fails with a no data found exception.
Has anybody had similar experiences with deferred activities? Any ideas?
Anu

Hi,
here's some more information. There are wait activities, for which the outbound queue id is a non-null value in the wf_item_activity_statuses table, but these ids do not have the corresponding message in the deferred queue.
We started getting these errors after a database server problem. The server ran out of space for the redo logs and started refusing connections. When it came back, we saw this situation for the first time.
Has anybody experienced such problems before?
Anu

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