In adopting the TSM 5.5 server level, you are on "the bleeding edge",
where no maintenance is yet available, and there is little customer
experience.  Your best bet is to contact TSM Support: be ready to
provide them with dsmserv.err content and Activity Log context, as
well as information on the level of your library and tape device
drivers.  The problem might be a recurrence of historic c0000005 errors.

   Richard Sims