If you're on the free plan and stopped collecting profiles, it's highly likely that you reached your monthly collection cap of 150 profiles.

If you exceed your monthly credit limit of 150, your collection will immediately cease and will reset at the beginning of the next billing cycle. If you have hit your collection cap and want to resume collection, please consider an RB2B Pro plan with a higher monthly cap.

Visit your credit usage page to see your usage and when your billing cycle resets.

Visit your subscription page to upgrade to a Pro plan that meets your credit needs.