Nice, thanks!
I was wondering if it was EM. There's about 35 feet of wiring between the switch and the LEDs in the wall, which would make for a pretty good antenna.
It shouldn't be an arc over the switch, since the switch is after the transformer (which is fully electronic, so no iron core/coil).
Anyway, I think with a modern electronic transformer, you'll end up with pretty good protection against power surges and similar mishaps such as short circuits. You could add separate surge protection before the transformer if you wanted to be sure, but I'm not certain what off the shelf options are available.
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