Something that I’ve coined over the last several years as a gamer, and my friends use it from time to time.

Gamer attention deficit disorder or Gamer ADD (verb): A person who is a gamer, but can not just play one game all the time. They will spend a few days playing one game, then another day or two in another, a couple days in another game, and continuing to jump from game to game to game. The person with Gamer ADD eventually will come back to the games originally played, but not for some time.