It could also be caused when the download speed is high, like 30 - 40MB/s.One thing you can try is, download the file when the 5G is on and when the network switches to 4g, pause the download and wait for some time for the phone to cool down, When th...

It is because of the heat generated while downloading large files, When the phone cools down it switches back to 5g

I guess you'll get the update starting of next month or end of this month, though I am not sure

I guess it's most probably not true

No, a14 5g won't receive the one ui 8 android 16 update since the last update is Android 15 and the Samsung Dex feature is exclusive to s series and z series