This didn't start happening until yesterday morning and I thought it was just a fluke thing so I ignored it, but it happened again last night.
It was fine before and I was able to leave the lid closed through the entire night and the game would stay up the entire time (usually 7-10 hours).
I did not change any settings.
I did not update anything that would have changed any settings.
If it helps, my laptop is an HP Pavilion dv6 1253cl with Windows 7 Home Premium Service Pack 1 installed. My graphics card is an ATI Mobility Radeon HD 4650 and it is up to date with updates. I use a "High Performance" power plan with pretty much every setting turned off or selected to do nothing when the lid is closed.
I can't figure out what the problem is.
I can list more details if necessary.
Guess I should add this, when I open the lid it shows the game disconnected with the notice one would see when the game is down for a maintenance or whatnot. The internet icon in the notification area shows me connected to wifi still, but it has the little yellow exclamation point that indicates I have no internet connection.