I suggest you get an electrician in to check the earthing arrangements for the charger and for your house!
When I renovated my house a while back I discovered that there was no house main earth!
There is now.
I'd like to second this one.
Same story, when I bought my house, the first thing I did was check the earth on all the power points.
One side of the house had no Earth connection.
It is possible that your car is revealing a fault in your home electrics.
(However, this should have been discovered when your charging point was being installed.)