Does the top manual on/off/program button feel more loose or more stiff than expected? Is the module in an area exposed where it could be tampered with? Is the panel used by anyone else to turn on/off lights?
If you have had repeated events where the device has turned on with no physical input at the device or the panel, I would consider first factory resetting the device: To return to factory defaults, if plugged in, unplug from the receptacle. Press and hold the top button for at least 3 seconds while you plug the switch into the receptacle.
Then remove the device from the panel and re-add it. If the behavior continues I would consider replacing.
The button is on the side (front) of the unit. It feels very stiff but it is with others.
It is exposed to sun, so maybe it heats up and gets “soft” and triggers. I switched it with another one to see if it does it again and also added 4 rules to turn it off at various time daily as a safety since it has to do with fire.
There is no one around this switch as its by the swimming pool equipment and no one goes by that except me.