Hi,
Dont turn both tabs on in bitstamp! One api per currency pair, there is only one pair at bitstamp. You will overload the api and get banned. Yea there are issues with bitstamp sometimes, I am not 100% how to solve them. Check the "support" tab at the bottom and see what it suggests.
The bitstamp website states that one is allowed 600 requests in 10 minutes, that is 1 request per second. I don't think the trade bots ever get even near that amount.
Regards, Rob