Hi there and welcome to JA,
The first thing you need to do is the ring the tech who you got out previously and tell him that it is still doing the same thing as before and that his cleaning of the drain pump did not work* The sooner the better also*
He is obligated to come back and have another look under a labor warranty*
I will be strait up front with you on this though, it sounds like one of the microprocessors on the main control module has failed or at the very minimum had an electrical spike/surge.
I asked my boss about this also, he is an expert with LG front loaders and basically this is what he told me*
He also said, that the machine has a self diagnostic feature, that when a problem occurs, such as an imbalance problem or any problem related to the running of the machine, it should be displaying the appropriate fault code on the screen at the controller.
If no fault code is showing, then it has to be a faulty controller. This is what governs the entire running of the wash programs and the hardware of your appliance*
Here are the fault codes*
Any follow up questions, just ask*
Dont keep using it at this point in time, as you will burn out the drain pump, especially if it is running for all that time. I am surprised it hasn't burnt out already actually.