Hi yes same here only way I get past it for temporary measures is turn on airplane mode for 30s then off again. As my hotspot disappears and WiFi also disappears. Was on phone with Apple well this was over 40mins with no luck as they wanted me to create a diagnostic of the issue. So I got cut of they never even called me back to finish the resolve
Case Number: 101191712302
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Case ID: 101191712302
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Apple
Very poor service indeed, as like most have said use WiFi and hotspot all time.
when this happen look at your phone see if your hotspot option disappears as mine does and then nothing works. After restarting the phone or airplane mode it then comes back on for a while.