Do I need a MOCA Adapter with my setup (v87 error)

I recently purchased a Tivo Roamio Pro ebay. Everything was working great until I decided to purchase 2 Tivo Mini's. I used the builtin Moca on the Roamio to view the TV on the minis. Just recently, I started getting the v87 error stating that the Roamio is not available. I try again about 30 seconds later and it connects with a problem. I provided somewhat of a diagram of my setup.

I was wondering would it be better to add a MOCA adapter to my setup or am I missing something?

Do I need a MOCA Adapter with my setup (v87 error)