I had bought a IQOO z7 Pro mobile recently from Amazon ... Device was everything perfect but the network is switching from 5G to 4G even in good signal Area ... Is there any settings that I need to change ? Or it will be solved in software update ? 

So kindly please solve this issue 

I had bought this phone only to get 5G network... If this was not solved I will Return the mobile

Below picture shows the signal strength of my location