Physics constrained actor sinks into ground after teleportation

Hello UE4-community,
I am trying to build a scene where the actor infinitely move along splines.

The actors are reset by a volume which places them in their initial location.

Certain actors are connected with physical constraints. When the location
of such two actors is reset, one of them sinks into the ground.

See these screenshots for clarification. Focus you attention on the position of the trailer.

The first screenshot is before the reset:

The second screenshot is after the reset, the trailer somehow sunk into the ground:

I reset the position using this blueprint function which is called by the “reset volume”:

The constraint is setup is shown in the following screenshot:

My question:
How do I prevent the trailer from sinking into the ground?

Thank your for time and effort!