Google will block repeated requests from software, giving your IP a temporary IP block. This can happen in Web Content Studio.
The first thing you'll see when this happens is an error message and the spider will refuse to run.
The following video shows a work-around I have introduced so you can keep on working until the temporary IP block is lifted (usually a few hours after the repeated queries stop).
Please make sure you have updated WCS to the latest version. You can do that via the Help menu. If the auto-update fails, you'll need to login to the download area and follow the instructions for a manual update.