God damn when those road sections spaz out and go into an insane spin. This certainly isn't easy to get something of the standard I'm aiming for.
Yeah, I had them do that as well, and sometimes I get teleported in the city (to a very specific street). I don't know what's up with that... but it's annoying.
Sometimes they "flicker" (is that the right word) like crazy, too.
I have too experienced this, just avoid using both prop clipping and prop snapping, sometimes when both of them are "on" you get teleport to somewhere in the city and your props start spin like crazy.