@ondrax 2 ways to solve this problem:
decrease the sensibility of the pir sensor
the sensor may be near a heat source (a lot of infrared is emitted), in this case move it in other place [I have personnaly this case, because my pir sensor is above my domestic heating. i move it and works]
Sorry my mistake.
I consider this module like OUTDATED and deprecied.
If you want an modern Assistant use: MMM-GoogleAssistant and MMM-Assistant2Display extension
I try new version.