@Oatler69 

Good day,

Thank you very much for your time and patience.

Could you please help me confirm the following details:

1. the 2^nd Deco was connected to the main Deco wirelessly, right?

2. to get rid of the distance influence, are you able to move the 2^nd Deco a little bit closer to the main Deco like 10 meters? Or swap the location between the two Decos to see if always the furthest Deco had the problem?

3. is there any chance that you could connect the 2^nd Deco via Ethernet cable to the main Deco?

Thanks a lot for your understanding and support.