Many lockloss labeled as IMCL can be seen in recent days. So I saw several ISC channels for some events. Then noise excess can be seen not only on L but also P and Y. And also, characteristic frequency of some of them (I haven't checked all events) are ~4Hz (e.g. Fig.1).

According to Ushiba-kun, it's close to a resonance of MCI_P (I heard ones of MCO_P and MCE_P are ~3Hz). So the noise excess on MCL might come from a coupling of P2L. Though it depends on the intention of "IMCL", there might be more proper category at least for some of "IMCL" events. (e.g. if it means that just a excess can be seen on MCL control signals, it's true. In this case, is it better to add labels also as "IMCP" and "IMCY"? On the other hand, it would mean some kind of a problem on the MCL control loop, I wonder we need to gather more detailed evidences.)