I depend on the 7KW wall box at work to charge my I Pace and have had no issues for six months, then my local JLR garage changed a module on the vehicle as the solenoid pin on the charge flap wouldn't lock. Following this work, the RCD inside the wall box would occasionally trip randomly during charging, and I would have to reset it. The frequency of this tripping fault increased to several times a day, so I called Project EV, who changed the wall box for a brand new one and we connected the I Pace with a brand new cable. This new box also tripped its RCD after two minutes charging. The car charges ok elsewhere, but I have no idea why the problem has become acute with the Project EV box. What is at fault?