OMC_LSC guardian stops again because no snapshot file is found (fig1).
This time, FIND_RESONANCE state was once passed but the OMC lockloss happened soon after OMC lock and the guardian tried to lock OMC again within 1 minute.

To solve this problem, I think up two ideas:
1. Wait 60 seconds at the end of DOWN state. This will guarantee the last image taking is at least 1 minute before the previous image taking.
2. Move find image process into exception handling by using try-except.

Probably, it is better to use the 2nd idea but I modified the guardian based on the first idea at this moment (fig2) because I have no time to test the code very well.

In addition, I confirmed LSC_LOCK guardian stops at LOCK_PREP state as we expect because the one of latch switchfor OMC protection function is closed (fig3).