Two forces in a contact simulation but BC problem

[seseb]

Hello,

I try to do a 3D contact simulation, but I have a problem with boundaries conditions.
Actually, the model is simply a cube with a hole and a cylinder (in z-direction) in this hole. Then I try to apply a force on the cylinder to get the stress on the cube.
This works well when I apply the force as:
...
DA,3,ALL,0 !constrains on the cube (volume 3)

ALLSEL,ALL,ALL !constrains on the cylinder
VSEL,S,VOLU,,1,,,1
NSLV,S,1
D,ALL,UZ,0
D,ALL,UX,0

ALLSEL,ALL,ALL !load on the cylinder
VSEL,S,VOLU,,1,,,1
NSLV,S,1
!F,ALL,FX,10
F,ALL,FY,10
...

but when I want to combine two forces as
...
D,ALL,UZ,0
!D,ALL,UX,0
...
F,ALL,FX,10
F,ALL,FY,10
...

my model never converge

Someone can help me?

In attached file, there is the input. Some lines are as comments for next step of this model (transient simulation)

Best Regards
Séb