Problem with a complex project

So I've been postproduction supervisor on a complex documentary proejct with I think about 40 tb of material, most of it 4K 2 camera multicams...  and 3 or 4 camera multicam performance shoots...  And a lot of archival material of varied formats.  I was not onboard at the start of the project and the first person organizing the project was something of a loose cannon...   

The clients got a imac pro with 64 gigs of RAM and has the latest OS update and up to last week we were running Premiere 23.2.   The client updated to Premiere 23.4 and the project would hang as it was trying to load.  I tried to create a new project and import it but Premiere would hang (spinning beachball)...  I took the raid with the media offline and the project still wouldn't load, but was able to create a new project and import the old project.  Saved the new project and then quit premiere, remounted the raid and although I was able to open the project, when I tried to load the latest sequence, Premiere would hang...  We reverted to Prmeiere 23.2 and could then open the project.   

We've been having recurring problems with outputting long sequences over the last couple of months...  One of my first troubleshooting steps before while we were still running premiere 23.2 was to create a new project and attempt to import the existing project...  Got a warning that the project was corrupt.  But the project would open directly without issues.. 

My instinct is that there's some corrupt media that's causing the issues...  I've noticed some .vts files in the project which were from an archival dvd...  and when loading the project occasionallyl get warnings about media not being able to be imported...  but we don't get these everytime and am not always able to access the error messages in the events panel...

My client just wants to proceed using bandaids to address each issue as it appears while I think it's worth digging into the media to see if we can find anything obvious.    And the fact is, everytime we face a problem, I'm able to figure out a way to get past it...  Sometimes takes an hour, sometimes 3 or 4 hours.  And in my experience, problems can evolve til your SOL...    And thinking bringing the project in to productions might be a good idea, but the client doesn't want to do this at this point.

Any ideas how to proceed.

I'm gonna shlepp my macstudio into his studio tomorrow to see if it works any better...

Will post back.  

Thanks as always