Some more testing done... connected 5V power source (thanks to SonyEricsson for old mobile charger :wink: ) to 5V pin in arduino nano, but it did not make any difference. Then I realised that maybe the there is similar reset issue with Nano than already reported with Mega, so I connected a capacitor between reset pin and ground in Nano and the restarts stopped! Weird enough, then I removed the capacitor again to see if restarts reoccur, but now mysensor GW works also without capacitor. :astonished: Let's see if thing keep working now... I'm little skeptic when things just magically get fixed. :wink: Few more "facts" about my system: Synology DS212, Domoticz version 2.4623, GW fake Nano 3.0 with CH340G serial chip