It seems (for various symbols) that while I get the recent quote (today is Nov 7), there is a gap and the last 2 days seem to be missing (previous quote is from Nov 4, thus two days are missing - Nov 5, Nov 6).
I don't think the issue is with the API, since interesting enough, also when I go directly to yahoo finance on my browser, I see this gap when I check for the 'historical data'.
(I didn't see anyone here experiencing this though, so not sure if it only bothers me :-)
https://finance.yahoo.com/quote/SPY/history/