Damaged objects

Hi group,

Lately our system, a 720 at V4R3 has been reporting a very high amount of
damaged objects and it seems as though things are starting to get worse. So
far this year I have had to run 4 reclaim storage and 1 reclaim DLO. I now
have to do another rclstg this w/e as there is once again considerable
damage on the system. A rclstg on our system takes about 37 hours. One thing
I am now thinking about doing is reinstalling the OS as I think perhaps that
part of it may have become corrupt ?
I have completed DR restores, built systems from scratch successfully in the
past but never just reinstalled the OS on a live system and am somewhat
hesitant about doing it on a mature system without finding out exactly
what's going to happen as a result. I'm sure someone has done this in the
past and would be very grateful if you would offer any advice on the
process, things to look out for, changes that may occur etc.
Any advice on any of the above will be very welcome.

thanks again
Neil