So yesterday I played Wolfenstein for a little while. I went on to play some other stuff and do other things on my computer. This morning I was trying to delete a folder on my pc. Completely unrelated to any of the games I ran yesterday, and it wouldn't delete. I went into my task manager to see if the video file was somehow still being held onto. While in there, I saw that wolfenstein was taking up 4gb of ram... A game I shut down more than 15 hours ago... I'm fairly new to W8.1....is this a common issue?