My father, bless his heart, leads the league in computer problems. I've lost count of how many times he has had to change email addresses because of suspicious activity or his account simply no longer working. He will routinely call me with questions about a malfunctioning laptop, tablet, or printer. I try to help, but it's hard to do from four states away, so I tell him to call a professional. If tech support had something equivalent to frequent flier miles, my dad would never have to pay for anything again for the rest of his life. Anything.
I can't explain this phenomenon except that maybe it's because no one in my family is particularly computer-savvy. But I've had the same email address for over a decade without incident so my father must be clicking on something malicious. And it once led to serious problems that ended up costing him hundreds of dollars and many hours with the aforementioned tech support professionals to restore order. Ironically, it was someone in a faraway land posing as tech support that made my father a hacking victim. I have since recommended that he no longer open emails and attachments if he isn't absolutely, positively, 100% confident that he knows from whence they came. That may not be enough.
Do you know the warning signs that you may have been hacked? And do you know what to do if you have? This video is a good place to start: