It happened today on a more recent file- see attached.  I stopped drafting right as it  happens and took a screen shot so you can see what I mean.  If I don't move a line to a precise snapping point it snaps to the bottom left of the screen.  So everytime I draft I have turn osnap on and off with F3- not a big deal but I'm curios why its happening to only me in our office. It must be a setting or drafting error.

I tried to bind all Xref's but foundation is being tricky.  When I recovered this file there were 50 errors as you pointed out with the other older file.