The posts that don't get attention go under pretty fast. Such is my post about that issue which is already on page 5 here.
As described there adding extra addons crashes FreeCAD on the next start. Without specefic combination of addons. You add something, it crashes, you remove something else - it works again. I cant disable them after the crash and had not tried disabling(not removing) the last installed after successfull start and installing the removed one again.
By "failure rate" I suppose you mean modules not loading because of error and not FreeCAD crashing? Which version were you ysing at the time? Had you tried with latest dev one?