Well, there are couple of how tos and FAQs, but your problem is just straight out of line and not covered by those. It is not supposed to loop after 10 words. Is it happening on Webapp or on your smartphone? Have you tried to switch to a different source (from web to phone or vice versa)? Have you tried to log out/log in?
I don't have a smartphone !
I've just logged in for the second time; it presented two more nouns and doesn't progress beyond that however often I hit the '>' (forward) button.
It was the browser (Firefox) ... it works in Opera, although LastPass keeps getting the way. I'll sort it.