Contact Problem ansys

[miguelaf70]

Hi everyone, I am having some problems while simulating contact on ANSYS mechanical, when the conact is between two plane areas it solves it without problem. However when it is between an esphere and a plane area it never converges. You can find the file attached.
Thanks in advance

 

[miguelaf70]

An I am also having some problems with impacts, the two blocks just ignore themselves though I have messed them like target and cONTA, Any idea about what the problem could be?