This morning, the IMC had a difficulty in relocking it.
It turned out that most of the IMCASC DOFs had accumulated some large offsets which had pushed the alignment so bad that it was not able to catch a 00-mode. This was due to the fact that we had turned on both the offsets (e.g. IMC-DOF_1_P_OFFSET) and the integrators, which off course simply accumulated the offset in the up front even when the IMC was unlocked. I disabled all the offsets as they are not necessary for now.