Ducane oil furnace randomly shutting down after just seconds... sometimes minutes, though. Sudden s/d accompanied by clicking sound (sometimes rapid) from electronic board/terminal block. I can make the s/d occur by moving thermostat wires (terminal strip moves slightly, clicking sound heard, shutdown). Service co replaced this board/terminal block 1 year ago for this exact issue. Ran fine until yesterday. Tightened connections on t-strip but still occurring. Bad board again or something I'm missing?