That can help, but I noticed that when I switched to a smaller class 6 8GB micro SD card, I all of a sudden had no problems whatsoever with my FLAC files - not changed from my setup in DB program. I didn't have to re-tag them, the player found them all and added quickly with a scan. Seems more like the mass of music can be a problem, or that it is very sensitive with the MicroSD card.
Right now, I'm not sure what to do. I have sent my previous card for RMA since I suspected it to be - well not working properly. It behaved a bit suspect with other devices at home as well. But I have to await the company checking it.
What this means for the iBasso DX50 I don't know. I know that they have bought cards that doesn't work from other people to get this checked out and hopefully we can get some news on the matter with the entire scanning of SD cards and the problems with it.