Tons of accs got toasted previous week. It seems that they decided to purge the most annoying ones. All of my accs survived, and one of them even got re-instated (after a decent work, though).
Not seeing any unusual activity on paypal's side when it comes to any of my accounts. No limitations or anything.
OP might have gotten linked somehow.
Also, a new account being limited for buying is nothing new. Several threads discuss that topic.
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AGED SUPER HIGH LIMIT ACCOUNTS: 10,000/$1,000,000 and 25,000/$500,000