What is the maximum SD card size your Moto X is rated to handle? Going larger could cause unusual issues. For reference, the Moto G this forum is for is only rated for up to 32G.
When you originally formatted the card as internal, did you immediately move the apps to it, or did you reboot the phone first? I've read you should do that after the format to help it finalize everything.
I know you cannot remove the card or anything like that. I'm just trying to find out if I can still copy files to/from the expanded memory via USB or network.