To the OP & tcoder:
PayPal has limited my account (even now it's limited for no apparent reason). To add insult to injury, their customer support is outsourced to a non-American company because they don't care about your money. They have much less legal obligation to pay you your money but the problem is not what you think it is and there is something different going on.
First, if you don't care about the explanation as to why this is happening then just stop reading right here and get a respectable Stripe account or deal with your local bank directly. Stripe is good, Authorize.Net is better.
I've looked into the issue for a very long time. I myself used to process ~$8,000 monthly with PayPal when I had an e-store. I know a business associate friend of mine who would process over $120,000 per month, and the ability for him to move funds was very important. As you can guess, both myself and my friend have experienced limitations from PayPal. They will make you jump through nonsense hoops to "prove" yourself innocent even though the entire justice system in America is supposed to assume you're innocent first, not guilty. Okay, enough rambling, here's the low-down.
1. PayPal limits account WITHDRAWALS in the name of security but it is actually a directive which has been given to them by banks in order to "help" with a growing monetary base (inflation). That's right, PayPal is not a bank. They hold your money (and millions of others') in order to help the central bank in your country lower inflation.
2. They use your money to fund high-risk loans without your consent. They can do that because, hey, they're not a bank. And in order for them to get returns on those loans, they have to maintain some balances to do so. Unlike central banks, they can't just print their own money, so they have to have some of yours.
3. If their fractional reserves do not meet their balance requirements, they will decide to "go after security threats" in order to hold money for a time long enough to recuperate the funding they need.