I just got a Bolt Vox and upgraded it with a 4tb drive with mfst. I didn't downgrade to TE3. I've transferred a number of shows from a Roamio. (Not many, as Optimum sets the copy bit for most shows other than PBS, and randomly most broadcast network shows.) A problem I'm seeing is that these shows will often lock up in the middle of playing (11 minute mark, 16 minute mark, 22 minute mark). The UI becomes unresponsive but will eventually respond to the Tivo button. These shows play fine on the Roamio, and stream fine from the Roamio. I've done a full extended Lifeguard test on the 4tb drive without issue. Shows recorded on the Bolt aren't exhibiting this problem, but perhaps this is early days. Should I be concerned? Hard for me to see how this could be something about the Bolt itself. It kind of doesn't matter whether I stream or transfer, and I may just stream because of the copy bit problem.