I believe this occurs when 3rd-party apps connect to your PayPal account (such as Mint, Quickbooks, Personal Capital, etc.) to download your transactions. This happens to me every time I use my Personal Capital app to track my bank accounts. These 3rd-party apps sometimes have direct connections to the banks, but in other cases they have to log in and access the bank website in the same way a person would. PayPal probably needs to update their API or connection method.
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