Garmin zūmo 590lm shutting down with osm maps?

I have a brand new Garmin zūmo 590lm. I have installed a open Street Map over California on it. (from
But I am having problems with it.
When I enter some addresses on it and try to Save it as a favorite the GPS just shuts down.
It also sometimes shuts down when riding and restarts after a few seconds… Just to south down again.

Is anyone else having these problems or have any ideas what I can try?

Im not familiar with the zumo but often a firmware update or a hard factory reset will help. Also corrupt gpx tracks can cause those issues so removing old tracks from the device can help too.

Hi -

Was this ever resolved? I have perhaps a similar problem in that after installing the map I need (Morocco) none of teh addresses I enter are recognised.