cros pi bluetooth device connection

hello, i’m not sure if this is an issue, anyone using bluetooth devices connecting to chromiumos on raspberry pi?

i have a bluetooth keyboard(with a tracking pad), it can connect and work with cros-pi, but when not using for a while, it disconnects, not sure if this is bluetooth device behavior or this is chromiumos behavior

when i tried to re-connect, it seems the pair button doesn’t work, i can see the light is flashing, but it’s not connecting to raspberry pi again
to re-connect, i need to poweroff my bluetooth device and poweron again, then it’ll connect

is this the expected behavior? thanks