Now, as to the hold. Yes, this happens frequently and has for years, ever since the Patriot Act (err, well, anti-money laundering act wrapped in a flag.) It almost always applies to the type of transaction you were trying to do (refilling an account from a bank account) where there is no associated transaction.
I've seen it localized to particular areas as well as globally - a particular pain for me as I sell CDs on eBay with customers around the world, and there's always a ticking clock for them to pay for their items. In places like Russia and Spain, many times they'll refill their paypal account and come across these holds (and I get to do a whole lot of work to help them.)
Generally, these holds last a few hours. Worst I can remember was an 8 day period in 2014 where I lost a fair amount of money due to Paypal’s holds preventing people from filling their accounts. It is always described when pressed as ‘terrorist activity’ as it is a Patriot Act hold that causes it.
Thank you for the info. I have been adding funds to my account for years. My Debit Card account is old, I opened it the first year Paypal had Debit Cards. I am grandfathered in at 1.5% cashback on it. And I never in all that time once was stopped from adding funds from my bank.