I’ve seen a few posts here and elsewhere about the so-called “Machine Gun” or “Jackhammer” glitch, usually related to the Beam (Gen 2). As well as being a long-time member here, I am also a member of various related Facebook groups. For the benefit of others, I would like to inform the community that the glitch has been discussed at least once in relation to an Arc, and I also experienced the same fault in a Roam. In my case the problem took a few months to work through with tech support, because unlike the mains powered devices, the Roam only exhibited the sound for a few seconds before it fell offline. My Roam also exhibited a power retention problem with the battery that was either related or unrelated, so it has been replaced under warranty for another reason.
Anyway, if you are experiencing this glitch and cannot explain it to anyone, this YouTube video helped me put a name to the problem.