> 14 V eh?
>
> Sounds like automotive mains.

Close - gel cell

> A nasty environ - I lost LM555's when powered
> directly off automotive mains YEARS ago - on
> one of my first projects!
>
> Solution was to add a real - sorry, an "RF" term
> there - add a series resistor along with a shunt
> electrolytic cap - any 'spikes' are met by (dropped
> across) the R (chosen based on some maths) against
> the influence of the electrolytic cap ...

No problem with spikes or anything else untoward AFAICT, this
particular regulator just decided to give up its day job

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