In my build I was using the Official Realtek 2.0.6 ethernet driver and it was causing kernel panics every 1-2 h so I uninstalled it and started using Lnx2Mac's and everything's working fine now. So maybe that will fix your problem too.
Yeah it reads just fine like SL but I can't write to it. I didn't want to install NTFS-3G before asking here because I heard of the native functionality. But maybe they were just rumors I'll wait and see.