A strange problem with message queues at V5R3 ...?

["Mark S. Waterbury" <mark.s.waterbury@xxxxxxx>]

Hello, all:

One of my customers (at V5R3, fairly current on CUMe PTFs) recently told 
me about this, and I signed-on to their system to see it for myself ...

Recently, his user profile message queue suddenly had thousands of 
messages re-appear -- messages that had been deleted over the course of 
the past several weeks or even months.

I did a DSPMSG ... OUTPUT(*PRINT) and the spool file was over 400 
pages.  All of the messages had the date and time when this problem 
occurred, in the middle of the night on a week-end, apparently. (The 
original messages were spread out over several weeks or months.)

I cannot recall ever seeing anything quite like this before.

Can anyone ideas that could explain how this might have happened?

Thanks.

Mark S. Waterbury