I'm currently creating trancodes of ArriRaw footage to DNxHD 36 for a film.
The first four clips exported without issues.
However, every clip since has created one large file with the correct filename eg. A001C006_190513_R18X.mxf, along with 4 other files called A001C007_190513_R18X_A01.mxf, A001C007_190513_R18X_A02.mxf etc.
Each of the 4 smaller files are of identical size, but their size will vary from clip to clip.