With sage, one thing I have learned is that it is not a once and done thing. You may want to keep a record of what is happening, as well as when and where it is occurring. Sage the entire house from top to bottom, record the date of that as well. Wait an hour, then open windows to air out.
Wait and see if more things happen. Repeat the sage about once a week and see how long it takes before more activity happens.
I am dealing with something myself, and my mistake was stopping my interventions before I had thoroughly driven whatever it was entirely away. Now it is an all out blitz and I have had a longer interval of peace at the present time!