We have four of these and all are acting similarly so not sure if the problem is our config or not, I did not setup these devices.
There are four CRS125-24G-1S switches one in each of four buildings on the campus. Each connects to and manages between 17 and 22 RB951G in unit devices.
Randomly, or at least it seems that way, we will see the dynamic bridge ports setup through the datapath command disappear from the bridge. If I disable and then enable the caps, the dynamic bridge ports will reappear.
The switches are running 6.30.2 and the 951s are running 6.28.
/caps-man datapath
add bridge=bridge1 name=datapath-profile vlan-id=100
vlan100 port is static in the bridge