In my house, I have a hard time getting the Roamio to even keep a connection to the internet over Wifi. I moved my router and modem next to the Roamio, so it could be hard-wired. There are too many wifi networks around our house all conflicting with each other. I've tried changing channels, but nothing seems to work.
On the plus side, since I have hard-wired the Roamio, it makes it so I can use it as a MoCa bridge, so the mini in the other room can just use MoCa.
I do plan on wiring my house for ethernet sooner or later.
I wish you good luck if you are attempting to stream via wifi.