Sometimes when you have a program like IE going on in the background, some sites automatically minimize what you are currently doing to go to that site that you just pulled up when it loads up. That could be the case if have things running in the background.
No im not alt-tabbing and i dont have any programs running.
I found out this happens with other games aswell but not with Photoshop or internet, only games
i don't no much about computers.i have same problem ever time i reboot i have program i block in terminate it on firewall and all is good.|winlogin.exe| and it's more like every 5 minutes it minimizes.i use sygate pro it was refreshing my desktop every 5 minutes or so.