This afternoon and this evening the IMC has not been staying locked for long, 10-30 minutes at a time.  Thomas and I checked the OLG, which seems fine at around 40kHz.  The alignment of the IMC also seems fine. 

I don't know what the problem is.  Earlier this afternoon I disabled the ISS since that was railing, Jason is planning to adjust the alignment into the PMC in the morning which will probably help.  We can see if the PMC adjustment tomorrow helps with the problem.  

We were planning to set up a single bounce measurement with the IMC VCO scan, but since it is a long measurement it won't work with the IMC not staying locked.  

Earlier tonight I also started a guardian state for a MICH dither alignment in the ALIGN_IFO guardian.  The plan is to replace the step that operators do by hand in the initial alignment, Craig and I I edited PREP_MICH_BRIGHT_ALIGN to set up the oscillators and demods, and checked that the signals look promising.  This job will also be easier to finish with the IMC staying locked.