The hardest faults to uncover are people who come about only Now and again—intermittent gatherings. They may be a result of lousy connections, dust, Grime, corrosion or just damaged wiring or connectors. Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u