This does nothing to help with your problem, but it sounds like freeze/thaw issues with moisture getting in at the expansion joints ... I guess I understand the thinking of having an unbroken driving surface, no expansion joints to thump across ...
ever see the effect of a little dirt, a little water, and a winter freeze in a block of granite?

I think I would live with it, do what I could to slow the process, and move on.

Of course, firing all your employees HAS probably freed up a little cash outflow, so, ah hell, get it tore up and build a new one.

Sorry, just jabbing at you a little, I'm a sarcastic miserable old crank ...