If you have problems with the MyStrom Switch, the homepage at the link below is a good place to start.
https://mystrom.ch/de/wifi-switch/
and
https://mystrom.ch/de/support/wifi-switch/
I use two MyStrom switches for Christmas lighting with electronic time setting. I had to replace one of the first older MyStrom switches because the switching contact got stuck and I could no longer turn it off with my finger at the top of the switch symbol.
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