Prusa MK3s stuck on "printing locally"

While changing filament on one of our USB Prusa Mk3s printers, 3Dprinteros registered the printer as “printing locally”. The only way to allow the printer to be used again was to power cycle the raspberry PI. What happened here? Is there something I need to do to prevent it?

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Could you please follow this guide to report the problem from your 3D printer?