Many things can break a song. Given what happens, the most probable offender is a long song ID. How long is the RBA filename? Or, if you're not using rb3maker, how long is the song ID? Try using a shorter song ID, if the current song ID is long.
The RBA is actually quite long, longer than I thought. Definitely longer than than the previous songs I have made. I'll shorten it out when I rebuild it for the xth time.
I'll let you know how it goes. As far as the song itself, its 6:21 in length. I know that sometimes long songs can do that, but I have only heard of it affecting the magma process when its 10+ minutes.