Dear @hugues.monard ,
My apologies for the late follow-up and thanks for re-iterating on the issues here. Unfortunately for the computer/operating system side of your issues I lack the expertise to comment. Do you still encounter the PWNINE and trackr common error messages? As I can gather from other forum posts which highlight the same error message that you encountered, these are rare cases of floating point precision errors and unlucky random sampling.
Cheers,
Andreas