Hi,
This happened probably two weeks ago. Per GM email response, I'm posting this bug report here to see if others have any feedback on it. On Everlasting server, me and a few SG/coalition-mates were doing a +4/8 Market Crash trial. The settings were consistent with +4/8, then as we entered last mission, it switched randomly on us to +0 difficulty setting. I was team leader, so I did not switch the difficulty settings at any time during the TF. The team at first discussed everyone logging out, then having difficulty switched to +4/8, but at that point everyone just wanted to finish the trial, so we wound up completing it at +0.
Best,
Kenny (Krow)