I gonna give it a try, but not sure yet if itś nophet or nohpet! :(
Sorry for the typo. I corrected it in the post. The correct flag is nohpet.
The nohpet option worked for me for a while, but then the problem came back again. I had found in another post that intel_idle.max_cstate=0 also worked. For me the second option worked intermittently, but both options together are working consistently.
That worked very well for me!Thanks for the hint.Pier (http://glave.altervista.org)