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DRV8353: VGLS pin not stable or damaged

Part Number: DRV8353

Dears

We have run the device with 120kHz PWM, with a Qg = 55nc MOSFET, and FOC BDLC control. and find that the VGLS have square wave with period of 400us and duty of 100us low. it is likely a protection of over load happened. so is there some suggestion? if we have a 22ohm in serial with the device and the gate, the VGLS square will happened less, sometimes n Fault will also active. so want to know if we have see this before. the supply is around 28V, and output power around 80W.

thanks

Jun Shen