from reading on the forums i suspected the SD may be the culprit, i reformatted the card and copied over the data again.
it doesn’t happen on the same frame every time, it seems random, but quite frequent.
I could try a different SD card. I got a quite cheap one, my assumption was the read and write speeds don’t need to be anything super fast, but this one was brand new this morning.
perhaps there is an issue with the micro SD board. I will see about getting my hands on another one of those as well, then i should be able to test with a new SD board and a new card.
perhaps I have a damaged neo-pixel somewhere, but it seems to affect the LEDs closer to the signal start more frequently than the ones at the end of the string. Perhaps this logic doesn’t actually apply.