1) Try a different microSD card, sometime a Garmin device will get fussy about one card but will accept another with the same map without problems, even if the second SD's the same brand and size.
2) Reformat the microSD in FAT32 and then reinstall the map on the mircoSD with MapInstall (NOT MapSource, it will give errors converting modern NT/U map data). Use the official SD Association format tool rather than the built-in Windows formatter:
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