It's a 50/50 split for me in terms of getting the emails. It's annoying, but until it's resolved---if ever---I guess we'll have to utilize notifications from the eBay app.
EDIT- From what I can tell, the orders which are having such issues all have one thing in common: their funds are pending instead of being on hold until delivery. Moreover, on the Notifications page it says "Sold- Awaiting Payment", but on the actual Orders page it claims payment has already been made and the items must be shipped by tomorrow, which makes sense based on the Payment status. So my current theory is it's the notification glitch that is holding things up.
I would think this is something eBay should be able to resolve. Guess I'll message them.
