"NW_PILOT" writes:

Take a look at the AOPA Nall report. The accident rates with flight
experience drops until you reach about 2000 hrs, then it starts climbing.
Pilots with greater than 10,000 hours accounted for 10% of all the
accidents.

Maybe they get to relaxed and over confident?

Sigh You can't infer anything from the above numbers. You need
rates, not totals. It's just as likely--moreso, really--that the
high-time pilots fly a disproportionate number of the total GA hours,
so (assuming their accident rate per flight hour is not greatly lower
than the rate for lower-time pilots) they incur a disproportionate
total number of accidents.