> We are unable to investigate more ... hangs happens
> after about 4 hours. Nothing on the logs, nothing on
> the console. Hangs happens with server idle or busy.

What kind of console device are you using? PS/2 keyboard; USB; serial port?

Is the X11 server running?

Did you try to boot with kmdb (boot Solaris with option "-k"), and when it
hangs, try to 

  type:  "F1-A" to enter kmdb
  
  run the command "$<systemdump", to write a crashdump and reboot


Is it possible to enter kmdb when the machine hangs, by typing "F1-A"?
 
 
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