Last night, there was a malfunction of the control of one of the NCal that did not correctly measure the rotation speed. This was triggered by a drop of the LED power around 20:45 UTC. This ended this morning slightly before 3:00 UTC. As a consequence, two new lines were present during this period, one at exactly 36.36 Hz, the other one, not very stable, around 39 Hz.

There was another short occurrence of this issue around 8:30 UTC.

To mitigate this issue, we plan to adjust the NCal LED threshold as soon as possible.