One way that works for me is to initialize all registers after reset and
run with WDT on, and deliberately allow the WDT to trip every time you can
afford it (i.e. about every 2 seconds in the idle loop). This means that
you have clrwdt instructions only in a certain shared main program branch
but none in the main loop, and some in longer duration subroutines. So far
this scheme has worked well with inconsistent power supplies and other
problematic projects. But I am not a large volume manuf..

Peter

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