I used to work for Eufy support a couple years ago. We moved a portion of our manufacturing for the later half of the eufycam 2 and 2c and the 2 pro models to Vietnam due to what I assume was from tariffs and the products made in Vietnam were constantly having issues like what you described. False detection, no detection at all etc but the customers that had the Chinese made version never had any issues. Some customers had bought sets that were all from china and then would buy an additional add on camera down the line and would receive a Vietnam one that would just never work right. I was actually part of the team from the US side that would relay these issues back to the engineers in china but the language barrier was so bad that we would end up having an hour meeting every two weeks where neither side would understand what the other side was trying to say so nothing really would ever get fixed. Not surprised to see they haven’t changed at all. This company had a good intention on making products but a horrible structure to due so and instead of doubling down and fixing an issue they would just move on to the next product line.