My suggestion is that there is debris in the fuel tank. Debris may settle and mess with the fuel screen in the tank. Then rest on the bottom of the tank until it is stirred up again to mess with you. Hope you find the problem.
I don't know that much about diesels but have seen the problem on older cars.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T