As observed mobile heating happens when you on the mobile data, it's clear that you are at network problem area, due to this the mobile tries to catch the signal which are weak this puts stress on cpu in-turn heats up the device. To fix this switch f...

No for S24 also there were some lag, like switching from apps to recent tasks, don't worry be patient and enjoy the stable version when it arrives.

The one ui 7 on S23 is still in beta, wait until it's stable version for better experience.