@LarsK1 Hello,
Tapo camera supports Channel 1-11 on 2.4Ghz wifi and remote or local control of camera should not be affected by diffeent WiFi channel of router.
For ' the camera is only reachable, when the wifi channel is set to 1,5,9' do you mean camera disappear or offline on Tapo app at that time? At that time was your cell phone connected to local wifi ?
May I know the model of your router, and does camera connect to the camera directly (or what is your network topology)?
What is the model and IOS or Andriod OS of your phone?
Can you share me a photo of your router's WiFi channel settings, and help collect the log of camera after issue happens, thank you.
How to get the logs of Tapo camera
Step 1: Insert an SD card into the camera.
Step 2: On the APP, please go to Camera Settings -> Advanced Settings -> enable Diagnose. The log file will be stored on the SD card.
Step 3: Let the camera run for some time, wait for the recurrence of the problem.
Step 4: Please plug the SD card into the computer's SD card slot or an SD card adapter. Please send the log on the SD card to us. The name of the file is ‘Diagnose Log’.