the check box that says "keep me signed in" if I have to sign in every single time I visit this site?!
I rarely have to sign in, maybe once a month and I check in daily without entering my pass info.
If this is only happening to you and not others, then it sounds like a problem on your end, e.g. browser deletes cookies when closing. I stay logged in for about a month at a time, unless I clear my cookies and it looks like Chris has the same experience. That's a small sampling though, so difficult to assess without more input. What I do know is that I can't replicate the problem in 3 different browsers, so I have no data to work with.
Between my Samsung phone and Windows computer I need to sign in maybe once a week.
I don't think websites like it when your IP changes. Like if I login from home and work PCs it seems to forget my info more frequently. I use a VPN too, so if I click that around different places it seems to disrupt the websites where I'm set to stay logged in.