Since the 24th Dec. I'm having the following issues with the histor hotspot on my s21+
1) connection regularly drops out. Even though the signal is strong. Even though the internet works just fine on the phone, the hotspot connection gives the 'connected - no signal' error.
2) connecting new devices. If there is a device already using the hotspot. The hotspot will have to be disabled, then enabled on the phone before the new device will be allowed to connect.