Gfci 40amp breaker trips after about 1 hour on my hot tub. Only draw is a 4hp motor. 8/3 teck used to connect spa pack to spa panel

My new hot tub is connected to a 40 amp spa panel. Hot tub pump motor is a 4 hp.
The gfci breaker trips after about 1 hour even when the motor isn't running.
Meter tested and load is light. Could it be a faulty breaker?
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Don in surrey bc

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