I have two yoto minis and a lot of MYO cards of varying length. I noticed a little while back that any new cards just weren't downloading on either yoto. I did a factory reset of one that seemed to help; it downloaded all the recent stuff my son really wanted, but then I made another new card and it did the same thing. It shows as currently downloading but is stuck on track 0 of 20.
I changed my router to have a dedicated 2.4ghz ssid and it is using that, but it doesn't seem to make a difference. I can't do another factory reset every time I change up cards.