We found a singular period of about 5 minutes (September 11   02:02:00 UTC + 300s) in which the lateral band spaced by 1.7Hz from the 50Hz mains becomes "irregular" and at the same time its harmonic at 3.4Hz disappears in the usual sensor named ENV_CEB_ELECTRIC.

We tried to find a certain correlation with almost all CEB INF and HVAC sensors, trying to figure out if any machine has changed its state, but we haven't found any.