I was having problems with my 32gb sdcard from day 1 . It use to unmount suddenly and I had to re boot to mount it.
Also, the sdcard all folders where not showing when I connected the phone to PC.To fix this problem I followed the answer here and cleared data of External Storage App and I can no longer mount the sd card.
Moto g2 no longer detects the sd card. I have tried re booting many times.
Sdcard getting read in other android phone but not in my moto g2