CGMiner - Average Hashrate much lower over time than Current

[Getawhale]

Hello! I am new and just switched over from GUIMiner to CGminer, on a new Radeon 7970 that I picked up.

When I run the card for, say, a half hour or an hour or so, it runs at just about 700MH/s on the nose, pretty steadily.

But when I run it overnight, or while I'm at work (for extended periods, say 8 hours,) I see that even though it's running at about 700MH/s still, my AVERAGE hashrate over that longer time period is about 350MH/s. Uhhh? I'm not sure what is causing this to drop by so much.

I use CGWatcher to log Hardware/Nonce fails/whatever, but the logs are limited. It seems there were no hardware failures. And no getwork or remote failures. And I'm certain my Internet didn't drop. So any ideas why my average would drop by so much?

I'm mining at Eclipse. I've mined on their US2 and US3 servers. Any questions about my setup just let me know.

Thanks for any insight!

EDIT: Neglected to mention, I've tried some Google searching and haven't been able to find much on this issue

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[Getawhale]

Bump!