Copy/Paste Sngs is crashing BBM?

Been noticing a few of the premium beats, when I export out and then try to import, crashes BBM…Seemingly random and I cannot identify exactly what part of the song is causing it.

The Import bar goes to 60% and then it freezes and then BBM crashes.

Anyone have any ideas?

BBM latest version, BB latest FW.

And, when I create a new song to just copy/past all the parts from an existing song (because the import is crashing BBM) , even though a different name, BBM automatically appends a number 1 in brackets (sometimes a 2) - viz (1) or (2)
Are there some undocumented bugs in the latest BBM, or am I doing something in a wrong way?