Nigel wrote:

Can someone please advice what is going on here and also what the
solution should be - apart from putting the switch in the room...

This is a common problem with anything "clever" designed to replace a
light switch. Because switch positions are typically not wired with a
neutral, there is no easy way for electronic switch gizmos to draw
power, other than by "leaking" a small amount of current through the
bulb. This can cause a couple of problems; like those you are seeing. It
can also break with non incandescent bulbs.

--
Cheers,

John.

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