Good shot

Yes but it have a solution to train multiple voice model to avoid initial response.After wakes up it will accept any one voice because it only used for recognition not for command brother and i tell you fun fact not only bixby , google , siri also do...

Force stop the camera app and check another time

You understand but  Doesn't they think they are innovative

It will solve in i have also the same issue but i got update last weak it solved 70% now its ok brother check any new update