UPDATE: Sorry for the delay but vacations and back to work backlog are the culprates ;-)
So after going into limp mode a second time in 2 weeks, the only codes that were again in the ECU are P2135 and P1516 all related to throttle position sensor.
So i pulled both connectors apart ( the one described in the sticky and the one right beside it connected to the throttle body i guess!) and sprayed some contact cleaner in them and we'll see if it happens again when i will floor it sometime this weekend ;-) I must admit, i don't like it when it happens. It runs really ****ty and i'm afraid to break something... If it doesn't work i will have to do the connector bypass described in the sticky.