Help ZD30DDTI loosing power.

I have a zd30ddti 2005 engine and I was driving on a highway at 100k/h with cruse control on when for no reason the car slowed to about 80km/h for about 15 to 20 seconds I put my flat to the floor and nothing then for no reason the power was back and all good. this happened twice on a 125km journey. I have no ideas what it could be.

Sounds like the car has been going into limp mode and then resetting back.
On a ZD30 most commonly caused by Boost issues and/or a dirty MAF sensor.

Intercooler is possibly leaking and playing havock with the Map sensor. Is there any oil deposits on or under the intercooler?