I found this the other day:
If the song is saved last, just before turning it off, then the song is saved and everything is in order. But, if you save the patterns last, just before turning off, then such an error occurs - when you turn on, only the first pattern is saved, the rest disappear.
We can say that the problem is solved - you just always need to save the song again just before turning it off. But, logically, this is not entirely correct. The following usually happened to me:
After saving the song, I still edited the patterns, so I only saved them right before turning it off. Since I didn't change the sequence of patterns in the song mode, and already saved this song, it should remain in the device's memory.
Now, I found a way out of the situation, but I did it by accident, and this information is not in the instructions. Therefore, this can be considered a bug that needs to be fixed in the new firmware version.
I really like your products. I hope this point will be corrected.
Thanks!