"whisky-dave" wrote in message
...
On Thursday, 29 August 2019 07:27:54 UTC+1, Rod Speed wrote:
alan_m wrote
Rod Speed wrote

Never seen a dodgy switch or wiring do anything like that. Dont
believe
it.

I once had a failed switch with carbonised contacts caused by long term
arcing.

Sure, but that doesnt see the light keep flashing fully on and fully off
when its switched off.

Sounds like something is acting like a bi-=metalic strip

Yeah, tho those arent normally very fast. Forget if the op said how fast it
toggles.

or perhaps a spider ;-)

Unlikely too many spider would keep doing it over and over again.
A monkey might but you dont get too many of those inside a light switch.