Most probably due to wifi 2.4GHz interference
I recommend to read this guide below, especially bullet nº 3.
Most of it applies to zigbee networks in general:
If you’re experiencing issues with your Zigbee network on Homey, here are advanced troubleshooting steps to help optimize performance and stability, especially in more complex environments:
Power Supply Integrity
A stable power supply is critical for Homey’s performance. An underpowered adapter can lead to instability in the Zigbee network. Always ensure you’re using a reliable adapter providing at least 2A. Power fluctuations can cause disconnections or communication failures, especially un…