How do you add the products in the first place? If you are using an app, it's possible that same app is unpublishing them. That's a guess though so any extra details you can give would help give a better response.
★ Winning Partner of the Build a Business competition. ★ http://freakdesign.com.au
Avada is an e-commerce solution provider based in the heart of Vietnam where the best developers unite. Founded in 2017 by Mageplaza, Avada is responsible to complete the mission to help 1 million online businesses grow revenues.