This may not always be the case, but I have found that if I am logged into SF in more than one browser or device I get the timeout message. I don't usually log in on more than one device on purpose, so much as forget I was logged in on another. It doesn't have to be an "active" login either. Say I logged yesterday on my phone and then forgot select log out. Figured I'd add that information.
Having problems with SF loading in Google Chrome. Taking a longer than usual time. In fact, I select a forum (if i am lucky enough to get the forum page to load) and then view another website waiting for SF to load and then go back to SF. God forbid if I want to reply... Granted the delay is only 20-40 seconds and random as all heck, but I thought you should know.
Have a great day.
I did an response test on the site, and the longest ping time was Korea at 2.2 seconds. I'm not able to see much beyond that. I'm on google chrome right now, I'm not currently experiencing any issues. Not sure what's up with that @cymbele