Linkedin Group Message

I made and I bought several bots to send messages to group members on Linkedin, but with time the accounts are banned.

Anyone knows how much messages can be sent per day/hour?

Today after sending some emails to groups members I get "Your account has been temporarily restricted from performing this action because we have detected an unusually large number of page views through your LinkedIn account."
Tomorrow I will check how many messages I sent and I will let you know.

Yesterday I manage to send 1256 messages, I don't if it's the amount of messages or the ammount of messages flagged as SPAM by the user.