Hello,
I also have similar problem that the kami doorbell loses wifi connection and power after several minutes. when I press on button, it will wake up temporarily. In addition, i have not been able to update the firmware since it will crash midway when downloading to 57 out of 100. I have a mechanial doorbell and i have followed all the instructions as seen on the video and the manual. It appears that I have similar issues that others have posted. If a resolution has not been found, I would like to return it for a refund.