Strange behaviour when solving stick slip problem

Hi,

I'm modeling a simple stick slip problem using a block on a beam. The beam has a prescribed sawtooth displacement which results in the block sticking to the beam at low accelerations and slipping at high accelerations.

I'm trying to solve the problem in two steps:
1) I use a stationary solver to calculate the initial position of the block on the beam (in this way i also check if the contact between the two bodies works correctly).

2) By using a time dependant solver i calculate the displacement of the block over time caused by the displacement of the beam.

My problem:
The results of the time dependant solver are not the same as what you would expect. The block jumps up from the beam, while it should move with or slip along the beam. I added a gif which shows the strange behaviour.

I tried numerous things, but I'm not getting any closer to the solution.

I hope someone can give me some more information on how to solve this problem.
The model can be found here:
drive.google.com/a/avistotech....RILUNaS2pwbWc/view?usp=sharing

Thanks in advance,

Janeau