Transferring from Desktop to Tivo

I'm using Desktop Plus and transferring Movies from the computer to two different Tivo units (a Premier 3 and a Roamio). More times than not, the transfer stops anywhere from 27 to 39 minutes. So if I start watching it without checking to see if everything transferred, I get really pissed off when it abruptly stops.
I've talked with Tivo support with no luck.
Anyone have any suggestions
Thanks