My Premiere Pro Project File Size reaches a maximum at about 38 mb before being unopenable.

My Premiere Pro Project File Size reaches a maximum at about 38 mb before being unopenable.  i have to creat multiple simlarly named projects with about 3 or 4 iterations of my 35 min doc in each.  This is really laughable for a "professional" NLE.  I have a beast of a machine CU and GFX card wise.  64GB of RAM which may not be enough, really?  25 mins is not really that long.  It's a multicam project whith each interview being 2 or 3 cams.  Please, this should not be.  I have all my interviews/A Roll cuuts in one project and even that's not ebough to accomodate them all - the last 2 were lost, because it couldn't opn the last saved version.  This is completely ridiculous.  Now I will have to make sure I save all my cuts into another project to make sure it doesn't get too big. Seruously Adobe?