After the year of self-induced tumult that Sonos has been through, I can understand why some people are reluctant to spend money on the company’s products. But interim CEO Tom Conrad has shown that he’s determined to get back on track and revitalize Sonos as the leading whole-home audio brand. The contentious mobile app is in a much better place today than just a few months ago, though some customers still encounter bugs and the frustration of speakers randomly vanishing from their…