It also could be memory degradation. I've also started to notice sound glitching on a number of my kits on my 64GB card.
I swapped in my known working 32GB backup card to test, only to find it wasn't even bootable in 2box with No OS detected. Everything looked fine and readable on the PC however, so I copied everything off, formatted with SD Card Formatter, copied it all back. Now it's working perfectly, no glitching.
MLC cards... Now I need to do the same with the 64GB card, 2box is very sensitive to bad memory.
I swapped in my known working 32GB backup card to test, only to find it wasn't even bootable in 2box with No OS detected. Everything looked fine and readable on the PC however, so I copied everything off, formatted with SD Card Formatter, copied it all back. Now it's working perfectly, no glitching.
MLC cards... Now I need to do the same with the 64GB card, 2box is very sensitive to bad memory.