After the fix, it happened again and again. By tapping on the right speaker unit can solve the issue. If this continues I will disconnect the connector and weld it to the motherboard.
Just solved the issue. It’s a small thing in my case. If you remove the screwes you’ll find your motherboard. On the left side there is a small connector on the motherboard with 4 cables running to the speakers. Try to wiggle it a little and press it firmly… Thats it. Just a poor connection.