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Post: Hello Do your 230V cables run close to the cables connected to the IO Zero 32 or the Raspberry Pi power supply cable? If the high voltage cables run close or parallel to the low voltage cables they could induce a voltage spike when the 230V turns on causing a glitch either in the IO Zero 32 or the Raspberry Pi. Try keeping the cables as far apart as possible or use shielded cables between the relay board and the IO Zero 32 with the shield connected to ground. Another possible cause for the problem is the 230V device is creating a brownout on the power supply when it turns on, making the voltage drop for a few milliseconds which would be enough to cause problems on the IO Zero 32. You could try powering the IO Zero 32 from the Raspberry Pi power supply and the relay board from the external power supply, connecting a common ground between the two power supplies. Adding a large value capacitor of 1000uF or higher across the V+ and GND pins on the IO Zero 32 will also help smooth out the drops or spikes in the voltage going to the board.