Mary Fisher wrote:

Vote 4 - I'd forgotten about this but it's true!

Mary


.... And Vote 5. I had exactly this problem in a rented house & we
spend ages trying to suss out what it was. We thought it was something
to do with the bath as it only happened after someone had happened a
bath ... the real reason was that the light was only normally left on
for long enough when someone bathed.

My Dad suggested the light fitting - we changed it & never had the
problem again.

M