This has happened multiple times. I've reported this and I'm still waiting for it to be fixed. It happened again moments ago. I started a game and was nearing the end, close to winning the game. I went to make my last click that would end the game and give me my sP, but nothing happened so I clicked again. That click alone made the game end when I didn't even CLICK ON the "Give up" link! Not to mention that there's supposed to be a pop up confirmation when you deliberately click on that link. So again, there's obviously a bug with the game that causes the game to end suddenly when it's not supposed to. One click away, and the game ends - makes no freaking sense!
I've had this same problem happen no less than three times. First time happened four years ago. Here are the two times I got screenshots of it.
http://i.imgur.com/ZYFKPtH.png http://i.imgur.com/nIliend.png
And sometimes, this happens for the next game.
http://i.imgur.com/dzLLrhB.png
I've found that clicking and waiting ~5 seconds in between clicks prevents this from happening, so maybe it's clicking too fast that's causing problems.