Hello Neil
So if I am correct the watch dog is too fast you need more delay, my favorite chip for timing is the NE555 this would work well as a watch dog as with a spare pin on the cpu you could reset it. It would run at 5v without a problem its also low cost and stable. Yes with the storms any cables will pick up spikes so surge/spike arestors on all the cables would be needed. Also glad to hear the other problem is fixed.
Regards Paul
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