Midea MSE-18HRN1-MQ8W - 11.4 Resetting phenomenon often occurs during operation.; 11.5 Indoor fan speed out of control.

Service manual
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11.4 Resetting phenomenon often occurs during operation.
(That is automatically entering to the status when power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the following procedure:
11.5 Indoor fan speed out of control .
Just for 9K and 12K type when indoor fan speed has been out of control for over 1 minute