Automatic Transmission Torque Converter problems of the 2007 BMW 335

This is a know issue that BMW dose not want to resolve in all of their dealership. The problem that we are talking about is that the transmission shudders an vibrates between 1,700 and 2,200 rpm in 3rd,4th,5th,6th gear. The loss of power has almost cost me several accidents. BMW says that they will flush the transmission and replace the transmission fluid in hopes to fix the issue or possible replace the entire transmission and torque converter. . Every time I go and try to get them to fix it they want to charge me for a know issue that that have. I have been a loyal BMW customer and to be treated this way is just wrong. Especially when it comes to safety and the safety of others. BMW show take ownership of this.