Almost every day hundreds of threads are created on webmaster’s forums about limited PayPal account. We are using the PayPal account from last two years and our account got limited once. We contacted their support several times about this issue and came to know about various reasons why an account gets limited.
Although once your account gets limited there’s no way to restore it without sending them the required documents. So it’s always better to take care about your account so that it doesn’t get limited.