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Why is this happening?

Heavens-Above is being overloaded by apps for smart devices (Android and iOS) which take data from this site and reformat it for their own displays. We have tolerated this without restriction until recently, but as the numbers of apps installed grows and grows, our server is unable to cope with the load and we have already had periods when it becomes unresponsive, despite having upgraded our server hardware.

If we don't apply quotas, the site will soon become unusable for "normal" users and apps alike.

You can help by asking your app developer to do whatever they can to use the Heavens-Above site economically. Several apps seem to download far more data than they actually need to.