Engine cutting out, code 52.

Happened 3 times by now, that the engine "stopped", on the highway at around 100 km/h.
It still runs but won't rev up anymore.
Clutch in, engine off, starting again, and then everything is fine again, and I can keep driving.
But thing is, how often is this gonna happen now? Will it become more and more until it won't drive at all anymore?
I am very willing to fix it, but I'm far from home now, and don't want to do some bigger fixes here.
Code 52 popped up by the way.
Is there a temporary way to fix it? Or does it really need replacing of the speedocable?
Speedometer does it's work correctly though..

Its the clocks, the VSS is inside the speedo clock.

Okay, though the clocks are working fine. It's a bit off compaired to the gps, but always was.
And now, how further? Does it make the van run in a limp-mode already?

The speed needle will keep working ok.

Inside there is a magnetic reed switch, as the cable turns it moves a magnet past the switch, which sends a pulse to the ECU so it knows vehicle speed.

These switches break, but are part of the whole speedo, easiest to change the whole clock unit.