Weather not syncing

[Flyingbanana]

I have the Sprint Hero. I'm having a problem on the the HTC sense weather window below the time. The weather area keeps going blank everyday. I've gone into settings to check the "update automatically" box, but after go out of the menu and come back in, it unchecks itself again and canot get it to stick. I've got the stock ROM on there and have not made any changes.

Any ideas on what might be wrong and how to fix it ?