It has been SO annoying recently! Hopefully it won't interfere with the Altador Cup this year. It was already near on unplayable last year
I often wonder if it has something to do with your browser fingerprint as well. I'm away from the computer for a while so I'm not sure if it's changed, but since SC and Majin both had a 403 thrown at me when I tried to log in before, I suspect it sees something in the program's internal browser which makes it autoblock you. I'm getting deja vu writing this actually, aha.