I found the issue. Strangely it has nothing to do with the Yeelight app nor the Openhab system. It seems that it was just a coincidence that it did not occur when the openhab was off. It is my houses powerline, there something wrong with it, at least it seems like it. It crossed my mind yesterday and I directly did go ahead to try it and it worked. I enabled, under the Lamp and “Default State” the option “Save light state automatically” this did the trick. So it seems like there are some minimalistic very short powerlosses on the line where the lamp is connected (or at least the lamp thinks that) and thats why she turned always on again because “Auto on upon power resumption” was enabled.
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