NEW YORK (AP) – After weeks of going dormant, shares of GameStop have suddenly shot higher again, jumping 75% in the last hour of trading Wednesday and another 60% Thursday. It’s reminiscent of the shocking 1,625% surge for GameStop in January, when bands of smaller-pocketed and novice investors helped trigger a supernova for the stock of the struggling video game retailer. Last month’s surge underscored questions about whether the broad market is in a bubble. No clear reason seems to be behind this most recent move, leaving market observers to grasp at what little news is out there.