This is usually because of a low volume of tweets in the library. Twitter has certain algorithms that will block the same item being tweeted in quick succession. You can resolve this by adding more to your library, or to reduce the amount of times you tweet a library tweet.

Not at all! If you would like to use your own server's CRON or a paid for service to give you the control/reliability you need then the URL provided in setup will work with any CRON service.

Yes of course! Contact us here to request support.