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    Welcome to the wonderful world of the heisenbug *8') Commented Apr 3, 2012 at 10:14
  • When you say it happens 1 to 2 times in 20 days, does this mean that it takes about 20 days for it to appear or it sometimes appears after day 1, sometimes day 3 etc... Commented Apr 3, 2012 at 18:57
  • @Dunk there is no specific timing to it, but never appeared in a week twice so far. Commented Apr 4, 2012 at 4:33
  • @Shirish - I was leaning towards a clock overflow problem not being handled properly which I've seen a couple of times on systems whose problem seems to occur every so many days and upon further inspection, exactly every so many days (or multiple thereof). Commented Apr 10, 2012 at 18:52
  • What is happening while the system is paused? What memory/counters/hardware are still changing? What about when you continue? It seems like whatever changes while you do those operations is a clue to the cause of the problem. Commented Apr 10, 2012 at 19:01