Hi,
Betfair introduced a limit on the number of streaming connections.
See
https://forum.developer.betfair.com/forum/developer-program/announcements/30597-exchange-stream-api-release-connection-throttling-26th-februaryYou are allowed a maximum of 10 concurrent streaming connections from the same Betfair Username.
When you log in once, the software will use 2, one for prices and the other for orders.
So are you logging in multiple times, you should be able to log in 5 times without exceeding the limit.
But it's possible to fall foul of the limit if your connection to the API keeps dropping out.
Regards,
Mark