RRH62000 status byte

Good morning,

I am using the RRH62000 PM sensor and have noticed that, after some time, the sensor status byte changes from 0x0000 to 0x0004. According to the datasheet, this indicates that the "Fan speed is out of the set range." However, other data appear to be read correctly.

Could you please clarify what this warning might be related to?

Thank you,
Matteo