There was just an upgrade, it could be a bug that needs reporting. I did not see a downvote or un-vote against your post, so unless you were hallucinating the big money it does look like something went wrong.
You should report this on Github, it's really the only way to be sure the developers see it.
https://github.com/steemit/steem/issues
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Thank you, I'll try that route and see what happens. Not sure if it'll help, but I'm glad I took a picture of what it was earning at 3:01PM CST today to show my wife. LOL
I think this is not bug this is variation in Crypto currency and steemit that rules which directly intact with earning bot, in simple when you upvote to any content or you upvote o many many post then your Steem power diluted and in response your earning also fluctuate.
please read this post for detail
https://steemit.com/steemit/@shaheer001/hello-steemit-fellows-alert-alert-rewards-percentage-increase-in-voting-what-is-curation-rewards-must-read-this-topic-to-save
Here's the photo I took at 3:01PM to show my wife.

It rose to a peak of nearly $1,500 before falling back down to $1250 when it came time to pay out at around 7PM.
Ouch! that's a big drop. Good thing you snapped a picture.
Hope it is a bug they can fix.