It sounds like one of those 12yr old springs has sprung loose or broken. Front load washers have concrete around the drum to keep from jumping around and leveling it out. The springs do take a good bit of a beating. You should be able to see what the issue is by removing the front or back access panel and watch as a small load goes through. Some machine can tell there is nothing in it, so it will not do a cycle.
Sounds like the “agitator dogs” these are under the center cap of the agitator. They are small plastic wedge looking things, may be 3 or 4 of them. They cost at the most $10 or as low as $5 for all. Grab the center piece in tub & turn it back & forth, at some point it should grab & not turn, if not you could probably feel the grinding of the bad dogs.
Function turns on after pressing "JBL connect" button and "+" button at the same time for 10s. To turn function off, you need to plug the speaker in power socket and press the "JBL connect" and "+" buttons simultaneously for 10s. After you can use Bluetooth.
The ground wire going from the door to the main body is loose or broken. To much to go through to replace specific wire, you could run any new wire from door to body & see if its good. Hold down the lock button on the driver & passenger door at same time, roll down driver window. All 3 buttons at once.