How do I fix my beko washing machine WM5120W?

My Beko washing machine WM5120W is still not working properly after replacing motor and drain pump. Motor was burned out and drain pump was not draining water making awful noise. The drain hose was blocked which has been flushed through and seemed to be working fine. But during a wash cycle, it still cuts itself off, lights go out and can't switch on again. Sometimes I can drain or spin if I turn dial to these. Help.....???