i too noob to sreen capture...

ok try below and u will see it happen to urs N8 or not:
1. go to connectivity destination
2. delete ur 3g internet (later can set back with phone setup wizard)
3. left only your wifi within the internet destination
4. reboot
5. now open Log, and clear it (YES CLEAR IT)
6. walk out your house (YES WALK AWAY) where sure no wifi able to connect (better still go out yum cha for ~1 hour)
7. now open Log and see got wifi connection triggering or not (if not then u LUCKY B*TCH)
8. if yes then u will see the whole list is wifi logs
9. open them 1 by 1 and check the time stamp.
10. if u not the lucky B*tch then u will see each every entry are triggering EVERY MINUTE SHARP!!...
okliao boh... tired typing liao lah... tangan lenguh sudah...

Added on October 29, 2010, 6:43 pmhehe u ingat i'm soo dumb donno that kah?? it ONLY filter for VIEW and it's not filter what to be log and what's not to...
when the Log is flooded NON of ur old call log will be inside the log list...

That "Log" you meant logs all events.
What you should have is the "Dialled Calls" log. Put that in your shortcut bar widget. This only shows all dialled, missed and received calls.