I have the exact same issue and spoke to Eufy higher ups and tested the device with a multimeter and in fact it shorts out too long and even if you set it up and it works now… within a day or couple of hours its messed up again. I think when it switches back to AC recharge mode it gets messed up. Either way Eufy is incapable of fixing this. They say it’s not compatible with my mechanical chime and try to avoid fixing it. Think its terrible service really.