Several pages per query



I have been using the twitter API and receiving several pages for each query for the last 6 months.

For some querys I have been receiving more than 10 or 15 result pages.

However, since 2 weeks ago the number of pages returned by the twitter API has been reduced drastically. I am receiving a maximum of 3/4 pages per query.
Is there any problem with that issue?
Has the API suffered any change in relation with that issue?

Thanks in advance,