This may be caused by insufficient power due to an undersized or long power wires. All wires should be according to code requirements and the motor manufacturer's recommendations.
Your local power supply may be suffering a power drop. For example: during a heat wave when every possible cooling appliance has been turned on in your area, your pump may be starved of the power it requires to run cool. Restart your pump when the weather cools to confirm that the problem is in the motor.
Your pump has a thermal overload, which will shut the motor off when it gets too hot, and it will restart itself once it has cooled down.
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