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2) The motor is tripping due to overload. I think overload relay setting should be checked. As a thumb rule, this relay shall be set between 15 to 20% of motor full load current. Check manufacturer's recommendations for required settings.
3) if the trip appears at the motor start phase the soft start can be failed, because it should reduce the current to the limit value.
4) if the trip appears when the soft starter is bypassed then the motor is mechanically overloaded.
5) Check the soft starter settings. There should be ramp up time of 10 sec and initial voltage to be 40%.
soft starter (and at all VFD locations) if you do not already have them.