Twitter rate limit exceeded (ajax scroller)

I'm having a bit of trouble with the ajax scroller while using the Twitter content type. I am specifying the Twitter timeline as "User timeline" with the Twitter username filled with the correct username. The scroller works fine mostly, but occasionally I get the text "Rate limit exceeded. Clients may not make more than 150 requests per hour."

I have the cache enabled and the cache time is set to 7200 seconds.

I should note that my subscription for the scroller has expired and i'm using the old version 2.0.3. I don't mind upgrading, but I want to be sure this won't still persist if I do upgrade.

If you use caching this should not happen. Maybe your caching doesn't work correctly because of folder permissions or something.