If you're new here to the PBE , you might not know that we run daily weekday maintenance to update the PBE with bugfixes, new content, etc. to make sure things are stable for upcoming patches. Sadly this means the PBE needs to go offline for a period of time, and you will be logged out.
Apologies to all of you that just managed to get logged in! At the time of this post you'll probably have time for one or two games depending on how fast you get your 3 star Vayne with triple rageblade.
Update: PBE is back up for today. I'll keep this post stickied for the time being for future maintenance windows.