I also had the same problem of WD Photos not showing all my Photo folders and only recognizing about 50 more pictures each day. Solution . . . . Unplug the power cord of the drive, then plug it back in. The drive will reboot and after an hour it started installing about 800 pictures per hour. Alot faster than before. After five or six hours it may slow down again, however, I just unplug it again and it downloaded pictures to WD Photo faster again.
I also have a case # about this with WD.
