Auto-fallback to contribution list page

[sushidave]

Describe the bug
Sometimes during creating a contribution there is an auto-fallback to the contribution list page. All new content in the editor is lost.

To Reproduce
Steps to reproduce the behavior:

1. Create a contribution.
2. Edit the text.
3. Sometimes during content creation the page and content disappears and the contribution list page appears.

Expected behavior
Stay on editor page until the Cancel or Publish button is clicked.

Screenshots
None.

Desktop (please complete the following information):

• OS: MacOS (other OS not tested)
• Browser: Firefox
• Version: 63.0.1

Smartphone (please complete the following information):
not tested

[sushidave]

It seems to happen not only by editing but also by viewing contributions.