5G causes signal loss

Everytime I turn on my 5G it work fine for a couple of minutes. After that the signal drops and have No Service. That happens in both “5G On” and “5G Auto” settings. In 5G Auto it doesn’t even switch automatically to 4G. When I manually switch it to 4G it works fine.

When I first purchased my IPhone 14 pro back in December, everything worked perfectly, but after an update (can’t remember which), it stopped working.

I’ve tried resetting Network Settings, restarting my device and also contacting my carrier and they said it’s not their fault.