I worked at my company for 6 years now. When I go out to lunch, I typically leave my office lights on. They remain on when I come back. Recently I came back from lunch to find my office lights turned off. Is someone trying to tell me something I thought? I don't know. But oh well, back to work.
Today this happened again, so it was not an accident the first time. It is not related to saving electricity because if it was, there'd be a company-wide message, and someone would come and address me directly.
With company culture it seems like it is acceptable to turn lights off in someone's else's office only at the end of the work day when it is clear the person has left work and didn't turn them off.
What do I do? My mind is full of "is someone trying to convey a passive-aggressive message to me?", is someone playing games? A prank? Do I attempt to catch the person? Do I go up to every coworker asking them who knows why my lights were turned off?
Note: my issue is less about the lights being On or Off. What bothers me more is that someone unknown has entered my office when I believe they didn't have any business being in there. Another part is my heightened anxiety that the lights being on or off have a side-effect of being used as a signal for when I am in or out of my office. For example, is someone trying to see when I'm back?