Loss of power / blockade of power

#1
Hi everybody,

my Corolla E12U (180.000km), built in 2005, Diesel 1,4 D4D, Automatic, regularly shows loss of power respectively blockade of power on the motorway.
The speed blocks in irregular intervals at about 80kmh, and even if I press down the accelerator completely, the car does not go faster. The loss of speed originated by braking or driving up mountains cannot be regained. At the moment of the loss of power the exhaust system sometimes smoulders strongly.
At the beginning the blockade went away by itself after a few minutes, but in the meantime I have to stop the car, switch it off, wait some minutes and start it new. Afterwards the car drives normally for some time.
I have already been in 3 different garages. As the problem did not show in the garages or during their test drives, they did the following repairs on spec: reneval of airflow meter, exchange of fuel filter and cleaning of the EGR valve. Unfortunately the problem could not be solved by all these repairs but still shows.
I love my car and I do not want to give it up. Has somebody already had a similar problem and can help me?
 
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