Mine seems to do this when the Economics window had focus, but something else popped to the front. For me, I usually have the Econ and Events windows on my 2nd monitor with Events on top. Sometimes I'll have Econ on top and advance time which can bring Events to the foreground. Then as I continue to advance time, Econ will pop to the front and then Events will subsequently cover it up again leading to a flickering.
However, I noticed that when this happens, if I go click Econ again and then click on Events to manually bring it to the foreground the flickering stops and it remains in the backgronud.