Another log in detected???

Tonight I lost two won games on time because a box came up with ' Another log in detected ' on it? Freezing the game, so that I had to restart the live chess page. Fortunately it went back into the game I was playing. Unfortunately, I lost precious time, which isn't very good when your playing blitz games. Anyone??

I've had that as well. First saw it yesterday.

its a pain. Only happens when I play on the actual site on my laptop, never on the app on my tablet or phone.

It only happens for the first couple of games too, not any games that I play afterwards for some reason?

I don't have it that often, only when i forget to force close the app(Double press home button). I usually am unable to place the piecies, I can move but can't place down the piecies.