Default [Q] MTP in Linux not working, any hint?

Hello,

I have just got a new I9195, I wanted to put my MP3 files and my pictures on it but then discovered that it doesn't have UMS :^(

I tried to do the transfers with MTP, I can mount the phone and start copying but after a few seconds my computer tells me that the connection has been closed by software:

cp: cannot stat /gs4mini/Card/file.mp3: Software caused connection abort

How can I keep the connection alive so that I can copy my files?

Thanks!