Keep getting locked out of Apple ID
2-3 times a week for the last month or so, I get notifications that my Apple ID has been locked, and I have to re-login everywhere, which isn't a whole lot of fun.
Figuring that someone was trying to hack me, I changed my password after the second time this happened. But it's continued since then.
Any idea what could be causing this, or what I can do to make it stop?
MacBook Pro 15″, macOS 10.12