Problem with CAB008M12GM3 in three phase LLC application

Duclair

We have an application featuring CAB008M12GM3 module in a three phase LLC configuration with gate driver UCC21710-Q1. The setup seems to works ok when running in a 2Ph configuration with 90deg phase shift light load, but when I try running it with a 3Ph PWM, with 120deg phase shift, the gate driver signals an overcurrent fault. I have a hard time understanding why. the OC detection circuit for UCC21710-Q1 in our application is setup for a threshold of 4V (estimated).

the switching frequency when the trip occurs is around 160kHz, the tank's resonant frequency is around 140kHz. the deadband is increased at light load, along with the switching frequency, with a minimum of 400ns.

Please, do you have any idea of what could be causing this?

Thanks.