Hello, our Geleaxy from the year 2011 with automatic transmission has for some time the following errors. Under load, i.e. during mountain climbing or acceleration it does not hold the speed. This always fluctuates in the range of approx. 200U/min. My car mechanic thinks it would be the converter between engine and gearbox defective? Can anyone say something about this? Does this happen more often than not with this car? What has to be done here, can the converter be repaired or where can you get a new one? ? I already had contact car parts24, they don’t have such a thing in delivery. In advance thank you for your help. VG Markus