We have a Joomla 3.8.10 website for a client with J2Store 3.3.1, hosted on one of our servers. When our client uses the administrator control panel to add several new products or make several edits, they are kicked out of the administrator backend and then see a "404 Category not found" error when they go to domain.com/administrator. Eventually they can log back in, but they need to wait a long time. We have circumvented this problem by migrating the site to a local server on our client's computer, where they do not encounter the issue, and then migrate it back when they are done making changes.
This is far from ideal, since migrations can be time-consuming. It would be better if the client could just use Joomla and J2Store as intended.
I would like to stop them from getting locked out, but the problem is so vague I'm not sure where to start looking. This issue is not happening on any of our other sites, as far as I know. Any help at all would be appreciated.