PASSWORD NOT RECOGNIZED

[McCallum Malcolm]

Hi Wamuggers, every so often a curious thing happens to me :-( and I  
would like to know why. I find in the AM especially  I have no emails  
so I click on  'Get Mail' and I am asked for my passwords for all my  
accounts which I duly fill in and get the msg that my westnet  
password is not recognized. I fill it in again and get the same msg.  
If I leave it for a time I then find everything works perfectly and  
all my emails download.  I feel there is an obvious easy explanation  
for this but what is it?
Mac