14:00 UTC ITF found in COMMISSIONING, CARM_NULL_1F
15:30 UTC ITF still locking: it locked at the second attempt with MICH_OFFSET 65 and SR ty+2. The range was low (down to 30 Mpc) and oscillating
16:38 UTC VPM process TF MONI restarted
16:41 UTC unlock
17:38 UTC LN3 achieved, range 40Mpc, as instructed by Bersanetti we waited for the range to reach at least 50Mpc to perform calibrations with ITF locked and ISC injections while staying in PREPARE_SCIENCE. It did not happen, calibrations and injections skipped.
17:44 UTC VPM process TF MONI restarted
17:44 UTC on: ITF kept locking/unlocking in LN3 for the following hours. Range 40-45 Mpc, MICH offset 58-65, sr ty+ 1-1.5.
20:30 UTC Instructed by Bersanetti, I commented line 6179 (BS full bandwidth, AATX_flag) in ITF_LOCK.py. MICH offset 60, SR ty+1.5
20:46 UTC ITF in SCIENCE, range 53Mpc
Sidenote: Was suggested another way to explore the issue, which is to keep the ITF in LN2 for at least 30 minutes, to see if the sudden unlocks happen there too and to investigate possible similarities. It was planned after the BS full bandwidth line comment but the ITF kep the lock, so Bersanetti suggested to perform this test at the first unlock available.
 

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