Connection closed when using PHP API part of the days

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We have used the Shopify PHP API for a couple of years now without any problem but yesterday June 1:st at 11.16 AM GMT+2 we started to get CURL error: `56 : SSL read: error:00000000:lib(0):func(0):reason(0), errno 104`. It takes very long time like 10-15 seconds and then we gets a connection closed.
We are sending in the product data as a json string. Transactions that happen between 06.00 UTC and 09.00 UTC work fine as they have been for years. Other time of the day we get the closed connection. If we remove the `html_body` tag to make the request smaller, it works. Still there are thousands of products with way longer descriptions that has been added before without any problem.

Has anyone had any problem like this?