According to Osho, the restlessness comes because your sense of “home” is still borrowed from the master’s presence. Away from him, the mind again feels homeless. This shows the connection is still superficial and the ego-desire remains. Deepen closeness, trust, and love until you “melt,” internalize the master, and discover the home within; then his presence abides in you everywhere and restlessness disappears.
You feel restless because you depend on your teacher to feel at home; learn to hold that home inside by trusting and letting the ego go.