VALLHORN ghost motion every 90 minutes

I installed a VALLHORN Wireless Motion Sensor to use it as trigger for a light. Everything works fine but I noticed in homeassistant that every 1:29 a motion is detected and the light is turned on:

it’s always 1:29 so I guess there is something wrong…?

ConBee III
Gateway Version 2.27.6
Firmware 26500900

Hello, I had the same problem with wrong batteries, you need Lada from ikea, these needs to be 1.2v. Other will cause false alarms.
Best regards!

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I switched from 1,5 Volt batteries to 1,2 Volt rechargeable batteries and the problem is gone. Thanks!