SG logging me out while idling for a few minutes/doing GA related stuff

So it started a few days ago, but for some stupid reason I thought that there's no need to pay it much attention. I also thought that it may be related to the Steam server issues related to the currently ongoing sale which could make their log-in thing go crazy.
Thing is though, the log out seems to trigger only when I perform action involving giveaways, like trying to enter a GA/editing the description of my GA or trying to reply to a comment on a GA page. I can comment/reply on the forum without much trouble. Happens on Firefox and Chrome, I literally had to fire up Opera just so I could reply to someone today.

Any help/suggestions? IiviI This is seriously starting to get frustrating.