Devices not connecting to 5g even being 1ft away from router

Hello, I double check this before and it was 100% still. I did change it to 25% a few weeks ago to be able to setup some iot stuff, but it was changed back to 100% for sure.

Since I couldn't solve the problem I did a unwanted factory reset today and it looks good so far. It's good to have full power again, but not great to know I may need to do that again and lose my configs.

Thanks all for help