Virtual product quantities keep resetting to 0

We have a number of downloadable, virtual products. I bulk set them all to be in stock, and manage of stock to no.

This makes all the virtual products in stock for an unlimited amount of orders.

However, after a short time, with the stock locations cron job, I soon find that all of these virtual products are set to be out of stock. It has happened time and time again. It goes through the list, setting them as out of stock, whether there is a stock location on it or not. It is breaking the functionality of my website and means I cannot publish the project as stock quantities are unstable. Can anyone advise?

Note that it even breaks on products that have a quantity set, as below. My cron job has been put together by the developer of this tool and he has said is correct, as follows: [mydomain.com]/?slw-crons&action=update-stock&limit=125&reconsider=hour

 

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