@tonw,
You need to check what other apps are running in the background.
How many other GPS apps are installed?
Did you do a lot of map downloads to the app?
Just trouble shoot what would make it run very warm.
Sometimes just shutting down your phone once every week or so will clear lots of problems.
I setup one phone and downloaded 6 countries while on external power and it did get warm.
But after that all ran normal.
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