[mod_python] mod_python session problem

code below:
from mod_python import Session
def index(req)
  sess=Session.Session(req)
  if sess.is_new():
    sess['num']=0
    sess.save()
  else:
    sess['num']+=1
    sess.save()
    req.write(str(sess['num']))
 
 
when I reflush the browser some times ,the session is usually lost .
I run it in windows XP(sp2),python 2.4.2, mod_python 3.2.8 

 
 
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