Why does the device regularly turn off the modem mode when distributing the Internet? even if the screen is active! this is very annoying.

Why does the device regularly turn off the modem mode when distributing the Internet? even if the screen is active! this is very annoying.

I'm madly angry! frustrated with buying an Apple device as even the cheapest non-iOS device never creates a problem

if you can't fix it, I'll throw my iPhone in the trash can and tell people about it