iPhone hotspot turns itself off automatically

IMO you have a poor connection

so

Check you have 3 to 4 bars of signal.

Turn off the phone, take SIM out and rub it with a dry cloth before putting back.

If still drops out you may have hardware fault so contact Apple Support directly. Depending on your region, you may be able to reach them here: Get Support

I feel your pain...

I’ve had 2 variations on this theme: 1 with WiFi and 1 with Hotspot. As u say ControlCenter gets out of sync with Settings. Both can simultaneously have a different value. More often than not On in settings, but Off in ControlCenter & u have 2 faff around 2 get it working.

People offer all sorts of suggestions about restarting etc and sometimes it helps; but it invariably starts misbehaving after a matter of days or weeks.

WiFi has been fine 4 me now 4 quite a while. But, like u, now Hotspot is misbehaving.

I don’t agree with people who suggest: maybe it’s off because there’s no device connected. Because, IMHO, Hotspot being enabled means your iOS device is discoverable... later u can c how many devices r connected. But if it switches itself off... it becomes undiscoverable.

On the bright side, for me at least, my symptoms don’t seem quite as severe as yours. Once I switch mine back on... and I connect 2 it, from 1 of my devices... at least mine will usually stay on & connected.

if a connection drops due 2 a glitch... fair enuff... but don’t go undiscoverable...

Is there a wifi connection nearby that is grabbing the device that wants the hotspot connection? You would have to make the wifi network not auto-join.

In any case the hotspot should power down if not active, to save battery . Staying permanently discoverable would be a power drain. Surely?

You are not talking to apple here, just other users like you.

It should stay on if a device is connected to it. Does it?

Check with your SIM provider if they support hotspot.

Your iphone, not all iphones.

Well 2?