I've been very puzzled by the lack of sales for the past several months. I think I just found out what happened.
For some reason, i decided to check all my eBid settings and discovered that "My Defaults" had been changed.
"eBid to Upload my BuyNows to Google Shopping?" was changed to NO
"Enable Multi-item Checkout (allow buyers to pay me for multiple items together)? was changed to NO
I'm not surprised our sales have dropped. And it explains why I couldn't find any of our items on Google Shopping when i posted about it a couple of months ago.