In the observing starting from Dec 24 20:47:52 UTC, the ADF servo seems to bring the squeezing to the wrong place, which caused huge BNS range drop. I asked the operator to go to commissioning and turned off ADF servo. I found that when squeezing angle is optimal, the error signal of ADF servo is not around 0 so I changed the ADF demod phase from 91 to 97 to make the error signal close to 0. Then I turned on ADF servo, accepted one SDF as shown in the attachment, and asked the operator to go to observing.