Minimizing every few minutes
Sounds to me that you have some app that is trying to take over your screen like maybe Skype.
put the correct term in but not everyone has kittens
Here’s a stupid question: Are you pressing Alt+Esc at all? Cause I keep doing this myself… Alt-Esc and Ctrl-Esc will both minimize your game.
Then again, I’ve also had some odd applications force-minimize my full-screen applications. If you’re not pressing the above two combinations, run a malware/antivirus scan and uninstall any application on your computer that you don’t trust.
Minimizing a fullscreen GW2 to desktop also happens if you have a dual monitor setup. GW2 doesn’t properly hold the mouse pointer within its monitor.
Sometimes, the mouse pointer appears shortly on the other monitor, even if GW2 is fullscreen. If you press a mouse button at at that exact time, for example right-click to rotate the camera, then whatever app is active (or desktop) on the other monitor is then given focus and GW2 is minimized by Windows, since it is a fullscreen app.
You can reproduce this by clicking near the screen border and move the mouse out of the screen while holding the mouse button. If you release the mouse button, the mouse cursor sometimes appears on the other monitor.
There is a tool called cursor lock that addresses this very problem (which only can happen if you are using 2 monitors), and according to the description this happens with many other games, too:
http://www.snakebytestudios.com/projects/apps/cursor-lock/