My project manager says she submitted a ticket, since several of us in my department are having this problem, but I think it's stalled out. Support needs a recording of the problem, which is a little hard to get. I'm not sure that any of my coworkers have managed to do this so far.
Sometimes during a day Workfront decides to log me out. This morning, I hadn't been online for even an hour when I found I had to log back into my tabs. Normally, I can stay logged in all day, but in the last couple weeks I'll occasionally find it's logged me out.