A5 front fans stay on after engine turned off
 

Back in December I had this problem where the 2 big front fans in front of the engine would come on full power as soon as the engine starts, and stay on for a couple of minutes after the engine is turned off. I took it to a German car specialist who ran the diagnostics and it come back saying the fan module needed replacing, so we got that done but the issue remained. They then had my car in the garage for a week trying to fix the issue, they said they had been speaking to Audi's technical team and had been through checking all the wiring etc. In the end he said he popped off the ECU to check there were no bent pins and when he put it back on the fans had stopped. That was 5 months ago and the fans have just started again now. Anybody had a similar issue to this? Car is 2012 Audi A5