Don't blame the Montana!
Sorry Casper but reading your post, you created that problem. It is a classic operator error. 
If you enable two different routing maps for the same area, you will freeze/jam the Montana (and every other Garmin unit).
It cannot calculate a route due to conflicting data.
The Montana was only doing the sensible thing and 'going to sleep' while waiting for you to 'reboot' yourself and learn that you can only use one routing map when calculating a route!!
Think of it as trying to cook two totally different recipies in the same pan;
Complete gobbledeegook resulting in something probably inedible.
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