Bosch dishwasher fault, model no: srs56l02gb ?

Hello, I have a Bosch slimline dishwasher, model no: srs56l02gb. It has an intermittent fault, being that it makes a loud bang and trips the fuse box on occasions. This can happen both when the dishwasher is during a cycle and and is not in use but plugged in. It stopped working completely on one occasion, I had an engineer look at it and it started immediately and was tested with various cycles and seemed fine. However, it has started making loud bangs again. I reset the trip switch and all seems OK until the next time. Do you know what the problem is? What should I do about it? thanks in advance,