New Jersey law firm Keefe Bartels is asking buyers of some BMW and Jaguar vehicles if they’re dissatisfied with the performance of their HD Radio units. It believes those sets may be “plagued by an inability to receive the digital signals transmitted by FM and AM radio stations and a significantly reduced sound quality when such signals are received.” One of the other problems cited by the lawyers: “insufficient numbers of HD Radio stations.” At this point, the attorneys are raising a flag, to see if there’s interest in legal action. The HD Radio technology is a product of Maryland-based iBiquity.