Phone won't detect SD card, yet (other card in phone) and (my card in other phone) OK

I've had my phone/SD card combo running fine for 4 months. (Moto X Play + 64GB Sandisk SD card) This week, my podcast app started displaying download errors; I soon discovered that the SD card was no longer being detected.

• (The Moto is running Marshmallow 6.0.1; the card is a SanDisk Ultra 64GB UHS-I/Class 10 Card SDSQUNB-064G-GN3MN)
• The card had been adopted as internal storage.

I performed a factory reset on the phone. No help.

• I mounted the card on my PC; it detected errors. Chkdsk said "Corruption was found while examining the volume bitmap".
• After correcting the errors, my PC could read the card just fine; folders and photos appeared fine.
• But still, my phone couldn't detect my card. Time for some isolation testing:
• Insert a different card into my phone: success. The phone detected the card.
• Insert my card into a different Android phone: success. The phone detected the card.

What's my next step? Thanks!

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