Two intermittent problems:
- Hotspot fails, not restored by Utilities. Laptop can connect to phone but no internet connection is created. Laptop doesn’t show “Setting up connection” dialog. Requires phone reboot.
- Hotspot working fine but turned off when not needed. Suddenly, data doesn’t work. Also requires phone reboot IIRC.
#1 is more common than #2, maybe 1 in 3 hotspot sessions. unless repeatedly turning hotspot on and off.