For the last few days, whenever I logged in, I would get a message saying that the active user had changed. And then other times throughout the day I'd get randomly logged out, as if someone else was logging into my account and becoming the active user.
I changed my password yesterday and it hasn't happened since.
If any of the technical staff reviews my activity, I do not change my IP address.
So if there are different IP addresses in my recent history, that should answer the question of ''if.''
Will probably never figure out the ''who'' part, though, if that's the case.
And I've enough technical experience to believe that it is the case.