Offering a different kind of near-future dystopia, “Warning” lets the clock run out on humanity’s stint in the background, while in the foreground we examine ways technology might usurp our lives in the guise of “improving” them. This first feature for music video director Agata Alexander, credited as “a film by” producer Cybill Lui Eppich, is a refreshingly offbeat series of faintly interlocking stories that hang together better than most omnibus-type constructs.