I can confirm that switching Hot and Neutral seems to cause this.
I have a ZD-915 which has the same issue. Since there are no polarised plugs in germany, the fix was easy: Just turning the plug around. The flashing has stopped completely.
But hoestly, i do not understand why this effect happens with switched polarity. Am i going in the right direction, saying that there seems to be some kind of leakage happening, since the neutral is switched and not the hot?