Since installing 8.6 I have begun to encounter very random lock-ups that force me to restart. Many times the freeze occurs when my computer is sitting idle (with no apps open). The ONLY thing that works is my cursor (so it's not a complete hang). Sometimes I can work for a day without the freeze, sometimes just minutes.
Anyone else with this problem? (I have tried the full arsenal of fixes: reinstalling 8.6, finder prefs, desktop rebuild, zapping PRAM, Norton DD, etc.)