如果一个页面空闲了一段时间,它会将用户重定向到主页上进行所请求的操作吗?

I'm looking over a website that has an unusual behavior.
I can't reproduce it on demand, but if the current page has been idle for a while (not sure for how long, but seems like it varies), it doesn't execute the requested command. Instead, it redirects to the main page - which is the homepage for the backend/admin panel on this particular site. It doesn't log the user out or anything. Just redirects to the homepage.

This is very frustrating since sometimes my client fills out a lot of data into forms, and when he then clicks "submit", all data is lost.

Any ideas to what can cause something like that? There's no CMS in use. This backend has been built from the ground up by another programmer some time ago..

Any suggestion is very appreciated.