I'm assuming that somebody has hacked my account and has "stolen" my password because I couldn't log into my messenger (several times) yesterday.
Every time when I tried to log in, I got "booted" and the following message appeared:

"You have been signed off because you signed in on a different computer or device."

Anywho, I can log in and use my messenger now.
What do you guys think?
Is there any explanation for this other than my concerns that I've been hacked?

and no I never signed in from another computer...only from my pc