Why has my iPhone started logging me out of the SDMB?

Straightforward question, istm. The phone is a plain vanilla iPhone 11. The browser is Firefox. All updates remain up to date. The issue begin about a week ago. If I don’t look at one of my browser screens that is open to the board for several hours, I will come back to a page with me logged out.

TIA

Make sure you’re pointed to the https server and not the http one.
Like this, https://boards.straightdope.com/

Moderator Action

Moving thread from GQ to ATMB.