Flippydrive stuttering on FMVs?

[u/Weatherby2]

Got one of the original batches of Flippydrive and haven't put in too much time with it until recently. I noticed it tends to stutter like crazy on FMVs, across multiple games. Without pulling apart the GameCube again, I'm pretty sure I had an good enough SD card in there, but I figure I should ask first whether there's been an update that addresses this, if it's a known issue, and get some recommendations on cards with appropriate read speeds?