Don't think it is an Apple thing. I'm all Apple here. I have many Apple devices including iMac, MacBook Pro, iPhone and iPad.
#1, make sure your operating system is up to date.
#2, make sure your browser is up to date.
#3, recommend Google Chrome as your browser. In older browsers, instead of "Forever" as the choice, I remember it used to offer something like staying logged in for 20,000+ hours instead. Maybe that went away because of an update to the forum software, or maybe to the browser. Don't know.
#4, I just tried logging in from Safari, Firefox and Chrome, and had no issues. Do not use Explorer. Way behind all of the others with HTML 5 updates.