You are a wise man 
and probably the wife has something to do with that 
But… imho working from home should be done with devices using LAN when possible, not WLAN (or have LAN connection available as backup connection 
).
I use 433MHz gear for 20y or more, and for 3y now with Homey in the mix, and it never switched on or off by itself 
But, nothing is impossible (I have learned 
)
Yup, solar activity can mess things up, but then indeed you can’t be the only one affected in your area.
I have added log cards to most of my flows. This way I can check if a flow was involved around the time of the ghost activity.
Another way is to check the device log:
