Recently got a garmin zumo 660. I got the maps I want to download to it but the keep getting erased. I haven’t even used it yet and after it sits for a few days and I go to look at a area all the maps I have on it are gone. The only two left are the garmin factory ones. It sucks because I took it out to use the first time last weekend and when I go to the location they were gone. So I came home and downloaded them again to the memory card on Monday. I just checked again and they are gone. What am I doing wrong or any tricks or tips?

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