One issue here is SEVERAL things happened, all within a short period of time, ICS was released publicly for the Rezound, Google Maps was updates, Google Play changed the way send out updates (deltas only instead of full APKs), and several people have tried the new 4.3.605.2 RUU. There is something related to some combination of Official ICS (3.14.605.12), the new update deltas format, the new Maps version, and/or Rezound firmware on 3.14.605.10/12. Other combinations of Rezound using other firmware (GB, 3.14.605.5, 4.3.605.x) do not have this issue with rebooting. This does not seem related to hardware revision at all.
The heat/battery issue is something else entirely, it is most likely a kernel thing since it appears in 4.3.605.2 the issues are mostly resolved.