Some security prices not updating

Since about two weeks to a month ago, some of my securities' prices are not updating automatically. Yesterday, a Quicken agent said to delete the brokerage accounts and add them back, which I did. The prices were correct at first, but don't update.

I have tried rebuilding price history. Also, I was managing the original accounts' transactions manually. I set the new accounts to download transactions from the brokerage, but that didn't fix the issue.

Anyone?