Why can't I download more than one email message at a time via POP all of a sudden?

All of a sudden, whenever my Mail.app mail client goes to download email from my gmail account, it can only get one message at a time. I tried switching pop servers from pop.gmail.com to pop.googlemail.com (and back), which in the past has helped when this problem has come up, but no go this time.

It's really frustrating! I usually get 20-60 messages every night that it now takes almost a half hour to pull off the Google server. Anybody have any ideas about what can be done to fix this on my end, or is it something that's up with the Gmail service?
 
sad I’m POPed out
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