The behaviour you describe on the Xiaomi Intelligent Humidifier 2 (switching off after <30 minutes + flashing orange light) is a fairly typical symptom.
The most common causes are these:

1. Tank not correctly positioned

This model has a level sensor/magnetic sensor:
if the reservoir is not inserted perfectly, the humidifier will run for a short time and then switch off.

Solution:

Remove the tank

Clean it and reposition it carefully until you feel it 'latch'.

Check that it is firmly seated on the base

2. Water level sensor blocked or dirty

If the sensor fails to detect water, the orange light flashes.

Solution:

Remove water

Clean the tank, float (if present) and sensor compartment

Fill it with clean water (preferably filtered water)

3. Scale or deposit in the ultrasonic module

A dirty ultrasonic disc can cause the device to fail after a few minutes.

Solution:

Empty the humidifier

Clean the metal disc with white vinegar + cotton wool

Rinse well

4. Safety mode / overheating protection

If it detects a lack of water or a problem in the flow, it goes into protection.