5GH home WiFi network won't show up in iPhone 13 mini and it truly annoying!

It’s already happening for a long time now, something happened to my phone (13 mini) and it won’t find my 5GH any more, I have ASUS router which is very good. What’s really annoying is that only on my main phone I can’t find it, something happened to it and since then it can’t find the 5GH network but when I read the QR code for the network it connects to it, more than that all of my other devices connect to it very easily (iPhone 8, 11 pro, iPad Pro 12.9)

I bought another iPhone 13 mini and did backup from the old 13 mini and in the beginning of the phone opening when I needed to choose a network to download the backup it showed me the 5GH network, I chose it and it did the backup and right after I couldn’t find it anymore again. I deleted all the apps from the new phone after the backup to see that it’s not from done app and still can’t find, also did reset to the network on the iphone and nothing happened except deleting all my saved passwords for all my WiFi spots!! It’s really sad that the big Apple can’t find a solution to that… in the days when internet is everything especially at home!

I already talked to the support in Israel and they were so not Profesional they even didn’t called back to see if the issue was fixed! I’m really shocked but apparently the priorities are different when we talking about the big Apple!