My New Motion integration EV Charging from Shell newmotion

McNally installed a Type 2 20KW 3-phase Wi-Fi car charger in the summer of 2022. Last night after a few days of minus 3/7 degree temps, the car charger unit continually locks out and fails. The fuse box is OK and we have tested the Audi ETRON EV with a 13 amp plug charger and all works fine. We have isolated the problem to the charger. Has any member experienced this problem with a New Motion car charger?