Asko W6021 Front Load Washer "drain makes gurgling noise" Questions

...gurgling sound (like wather bubbling up) coming from it when it's not in use. I turn off the water supply after each use, and there are no visible leaks. The machine is working fine otherwise. What ...

...makes a humming sound almost like it's in the middle of the wash cycle. Also you can hear some gurgling from the drain pipe. This lasts for about half a minute,then nothing. Doesn't matter how many ...

...makes banging noise. The banging is so strong that it causes machine to move physically . I had to stop the cycle and then after some time the door is still locked with error code LO. A loud banging ...