Hi.
Yep, same here. Build 73 broke my beaglebone bridge as well. Just came to the forum to see if anyone else was having the same issue.
As soon as I try to play something on it, it just drops off the network and roon asks me to select another zone.
It enables itself back online after some seconds, but breaks immediately as soon as I try to play anything on it. 
Edit: I see there is another thread on this where support is already involved, so I’ll just untag them from here and participate on RoonBridge Zone drops with 1.3 build 208