Hello,
same here with me. In the beginning all 4 were working fine, but then quickly after a few weeks one after the other went dead. I thought it was a bad battery batch (Ansmann via Amazon) and ordered new ones (no-name brand this time...). With this only one of my 4 sensors is working. Wasn't sure if this was a bad battery batch as well -> now I bought only two new batteries (Energizer) as 8 batteries cost quite some money... I tried re-setting and everything with two sensors, but both seem to be dead... Is there another way to factory reset than described in the manual? I am thinking of returning them to Shelly, maybe a bad batch on the sensors?
Thanks!
Martin