There can be many different reasons for a hotspot to get disabled automatically and cause trouble. Mentioned below are some of those reasons. You have exceeded the maximum number of connections allocated per connection. In general, the number of devices can range from 5-10. Your mobile device is receiving poor signals due to some reason or another. For instance, you may be located far away from the closest tower. If you get very bad reception, your hotspot is likely to get disconnected automatically. Your SIM card doesn't work as expected due to some reason. Perhaps, you may need to replace the SIM card.