On 2.7.5 I am having a problem with dynamic intensity dropping after running several hours.  I haven't figured out whether it is time related or triggered by something I do. It sounds similar to some other reports, but mine only drops to -7 instead of -9. It first happened to my second (of two crossfired) cards, so I set that to fixed intensity this morning, then when I came back this afternoon my primary card had done the same thing. So, I set my primary card to fixed intensity, then back to dynamic and that fixed it (Obviously, restarting also fixes it). This machine runs Windows 7, but I had it happen on a Ubuntu machine downstairs earlier this week. I have dyn-interval set to 30.