GPSMAP 66i - SD card work intermittently

Hi!

There is an issue about SD card on my 66i.

I loaded a new maps on the card from a computer, put in the device and power on and it work flawlessly the first time.

But if I shutdown the device, the device won't complete the boot sequence. It crash and shutdown itself.

And the weird part, if y take the SD card and read it on a computer without writing on it, the card would work like the first try. But the issue reappear after a reboot.

Is the device corrupting the files on the SD card?

The SD card has been formatted in FAT32, with just a "Garmin" folder with the map in it.
I've tried with different OSM maps in .img and different SD card, so we can exclude those.

Thanks!