Sony has been struggling to keep up with demand for its new PS4 controller, which went on sale just last week. The company has already received complaints about shortages from some customers. “We’re seeing a lot of people who are trying to buy the controllers and they’re not being able to find them in stores,” said one customer who wished to remain anonymous. “I think it’s because Sony underestimated how popular the controller would be.” The PS4 controller is a major selling point for the new console, as it offers improved functionality over its predecessor. Some gamers have complained that the new design is uncomfortable to hold and difficult to use. Sony has yet to release an official statement addressing these concerns. ..