Sonos laid off some of its veteran product and design executives.Once a cutting-edge audio brand, Sonos has lost a lot of its luster. Last month, the company cut three percent of its staff, which we now know included several veteran execs.The cuts include Dana Krieger, a vice president of design who worked as Sonos for 12 years, according to people with knowledge of the matter. Also leaving are Kate Wojogbe, a top user experience executive who was with the company for nearly 10 years, and Scott Fink, a 15-year veteran who helped spearhead the company’s home theater work…