Which version of MMW, MMA (if installed) and Android are you using? Is sync to internal or external memory?

Ive been trying to sync my moto x pure for 2 weeks over usb and wireless sync. About 1200 files, it get to last 2 and hangs till I restart. Instead of just syncing last 2 it goes back 150 tracks, everytime. Its converting and I have no conversion setup in the sync options...it just aint working right...